diff --git a/.config/nvim/lua/junikim/bootstrap.lua b/.config/nvim/lua/junikim/bootstrap.lua
new file mode 100644
index 0000000..4bf4cea
--- /dev/null
+++ b/.config/nvim/lua/junikim/bootstrap.lua
@@ -0,0 +1,16 @@
+-- Bootstrap lazy.nvim
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not (vim.uv or vim.loop).fs_stat(lazypath) then
+  local lazyrepo = "https://github.com/folke/lazy.nvim.git"
+  local out = vim.fn.system({ "git", "clone", "--filter=blob:none", "--branch=stable", lazyrepo, lazypath })
+  if vim.v.shell_error ~= 0 then
+    vim.api.nvim_echo({
+      { "Failed to clone lazy.nvim:\n", "ErrorMsg" },
+      { out,                            "WarningMsg" },
+      { "\nPress any key to exit..." },
+    }, true, {})
+    vim.fn.getchar()
+    os.exit(1)
+  end
+end
+vim.opt.rtp:prepend(lazypath)
diff --git a/.config/nvim/lua/junikim/plugins/luasnip.lua b/.config/nvim/lua/junikim/plugins/luasnip.lua
new file mode 100644
index 0000000..fea82cd
--- /dev/null
+++ b/.config/nvim/lua/junikim/plugins/luasnip.lua
@@ -0,0 +1,11 @@
+return {
+  "L3MON4D3/LuaSnip",
+  -- follow latest release.
+  version = "v2.*",
+  build = "make install_jsregexp",
+  config = function()
+    require("luasnip.loaders.from_snipmate").lazy_load({
+      paths = "./lua/junikim/snippets"
+    })
+  end
+}
diff --git a/.config/nvim/lua/junikim/plugins/ufo.lua b/.config/nvim/lua/junikim/plugins/ufo.lua
new file mode 100644
index 0000000..a057bed
--- /dev/null
+++ b/.config/nvim/lua/junikim/plugins/ufo.lua
@@ -0,0 +1,25 @@
+return {
+  'kevinhwang91/nvim-ufo',
+  dependencies = {
+    { 'kevinhwang91/promise-async' },
+  },
+  config = function()
+    vim.o.foldcolumn = '1'        -- '0' is not bad
+    vim.o.foldlevel = 99          -- Using ufo provider need a large value, feel free to decrease the value
+    vim.o.foldlevelstart = 99
+    vim.o.foldenable = true
+
+    -- Using ufo provider need remap `zR` and `zM`. If Neovim is 0.6.1, remap yourself
+    vim.keymap.set('n', 'zR', require('ufo').openAllFolds)
+    vim.keymap.set('n', 'zM', require('ufo').closeAllFolds)
+
+    -- Option 3: treesitter as a main provider instead
+    -- Only depend on `nvim-treesitter/queries/filetype/folds.scm`,
+    -- performance and stability are better than `foldmethod=nvim_treesitter#foldexpr()`
+    require('ufo').setup({
+      provider_selector = function(bufnr, filetype, buftype)
+        return { 'treesitter', 'indent' }
+      end
+    })
+  end
+}
diff --git a/.config/nvim/lua/junikim/snippets/tex.snippets b/.config/nvim/lua/junikim/snippets/tex.snippets
new file mode 100644
index 0000000..32ed5b3
--- /dev/null
+++ b/.config/nvim/lua/junikim/snippets/tex.snippets
@@ -0,0 +1,446 @@
+#version 1
+#PREAMBLE
+#documentclass without options
+snippet dcl \documentclass{}
+	\\documentclass{${1:class}} ${0}
+#documentclass with options
+snippet dclo \documentclass[]{}
+	\\documentclass[${1:options}]{${2:class}} ${0}
+
+snippet tmplt "Template"
+	\\documentclass{${1:article}}
+
+	\\usepackage{import}
+	\\usepackage{pdfpages}
+	\\usepackage{transparent}
+	\\usepackage{xcolor}
+	$2
+	
+	\\newcommand{\incfig}[2][1]{%
+		    \def\svgwidth{#1\columnwidth}
+		    \import{./figures/}{#2.pdf_tex}
+	}
+	$3
+	\\pdfsuppresswarningpagegroup=1
+	
+	\\begin{document}
+		    $0
+	\\end{document}
+
+#newcommand
+snippet nc \newcommand
+	\\newcommand{\\${1:cmd}}[${2:opt}]{${3:realcmd}} ${0}
+#usepackage
+snippet up \usepackage
+	\\usepackage[${1:options}]{${2:package}} ${0}
+#newunicodechar
+snippet nuc \newunicodechar
+	\\newunicodechar{${1}}{${2:\\ensuremath}${3:tex-substitute}}} ${0}
+#DeclareMathOperator
+snippet dmo \DeclareMathOperator
+	\\DeclareMathOperator{${1}}{${2}} ${0}
+
+#DOCUMENT
+# \begin{}...\end{}
+snippet begin \begin{} ... \end{} block
+	\\begin{${1:env}}
+		${0:${VISUAL}}
+	\\end{$1}
+
+# Maketitle
+snippet mkt maketitle
+	\\maketitle
+	
+# Tabular
+snippet tab tabular (or arbitrary) environment
+	\\begin{${1:tabular}}{${2:c}}
+		${0:${VISUAL}}
+	\\end{$1}
+snippet thm thm (or arbitrary) environment with optional argument
+	\\begin[${1:author}]{${2:thm}}
+		${0:${VISUAL}}
+	\\end{$2}
+snippet center center environment
+	\\begin{center}
+		${0:${VISUAL}}
+	\\end{center}
+# Align(ed)
+snippet ali align(ed) environment
+	\\begin{align*}
+		${0:${VISUAL}}
+	\\end{align*}
+# Gather(ed)
+snippet gat gather(ed) environment
+	\\begin{gather${1:ed}}
+		${0:${VISUAL}}
+	\\end{gather$1}
+# Equation
+snippet eq equation environment
+	\\begin{equation}
+		${0:${VISUAL}}
+	\\end{equation}
+# Equation
+snippet eql Labeled equation environment
+	\\begin{equation}
+		\\label{eq:${2}}
+		${0:${VISUAL}}
+	\\end{equation}
+# Equation
+snippet eq* unnumbered equation environment
+	\\begin{equation*}
+		${0:${VISUAL}}
+	\\end{equation*}
+# Unnumbered Equation
+snippet \ unnumbered equation: \[ ... \]
+	\\[
+		${0:${VISUAL}}
+	\\]
+# Equation array
+snippet eqnarray eqnarray environment
+	\\begin{eqnarray}
+		${0:${VISUAL}}
+	\\end{eqnarray}
+# Label
+snippet lab \label
+	\\label{${1:eq:}${2:fig:}${3:tab:}${0}}
+# Enumerate
+snippet enum enumerate environment
+	\\begin{enumerate}
+		\\item ${0}
+	\\end{enumerate}
+snippet enuma enumerate environment
+	\\begin{enumerate}[(a)]
+		\\item ${0}
+	\\end{enumerate}
+snippet enumi enumerate environment
+	\\begin{enumerate}[(i)]
+		\\item ${0}
+	\\end{enumerate}
+# Itemize
+snippet item itemize environment
+	\\begin{itemize}
+		\\item ${0}
+	\\end{itemize}
+snippet it \item
+	\\item ${1:${VISUAL}}
+# Description
+snippet desc description environment
+	\\begin{description}
+		\\item[${1}] ${0}
+	\\end{description}
+# Endless new item
+snippet ]i \item (recursive)
+	\\item ${1}
+		${0:]i}
+# Matrix
+snippet mat smart matrix environment
+	\\begin{${1:p/b/v/V/B/small}matrix}
+		${0:${VISUAL}}
+	\\end{$1matrix}
+# Cases
+snippet cas cases environment
+	\\begin{cases}
+		${1:equation}, &\\text{ if }${2:case}\\
+		${0:${VISUAL}}
+	\\end{cases}
+# Split
+snippet spl split environment
+	\\begin{split}
+		${0:${VISUAL}}
+	\\end{split}
+# Part
+snippet part document \part
+	\\part{${1:part name}} % (fold)%
+	\\label{prt:${2:$1}}
+	${0}
+	% part $2 (end)
+# Chapter
+snippet cha \chapter
+	\\chapter{${1:chapter name}}%
+	\\label{cha:${2:$1}}
+	${0}
+# Section
+snippet sec \section
+	\\section{${1:section name}}%
+	\\label{sec:${2:$1}}
+	${0}
+# Section without number
+snippet sec* \section*
+	\\section*{${1:section name}}%
+	\\label{sec:${2:$1}}
+	${0}
+# Sub Section
+snippet sub \subsection
+	\\subsection{${1:subsection name}}%
+	\\label{sub:${2:$1}}
+	${0}
+# Sub Section without number
+snippet sub* \subsection*
+	\\subsection*{${1:subsection name}}%
+	\\label{sub:${2:$1}}
+	${0}
+# Sub Sub Section
+snippet ssub \subsubsection
+	\\subsubsection{${1:subsubsection name}}%
+	\\label{ssub:${2:$1}}
+	${0}
+# Sub Sub Section without number
+snippet ssub* \subsubsection*
+	\\subsubsection*{${1:subsubsection name}}%
+	\\label{ssub:${2:$1}}
+	${0}
+# Paragraph
+snippet par \paragraph
+	\\paragraph{${1:paragraph name}}%
+	\\label{par:${2:$1}}
+	${0}
+# Paragraph*
+snippet par* \paragraph*
+	\\paragraph*{${1:paragraph name}}%
+	\\label{par:${2:$1}}
+	${0}
+# Sub Paragraph
+snippet subp \subparagraph
+	\\subparagraph{${1:subparagraph name}}%
+	\\label{subp:${2:$1}}
+	${0}
+# Sub Paragraph*
+snippet subp* \subparagraph*
+	\\subparagraph*{${1:subparagraph name}}%
+	\\label{subp:${2:$1}}
+	${0}
+snippet ni \noindent
+	\\noindent
+	${0}
+#References
+snippet itd description \item
+	\\item[${1:description}] ${0:item}
+snippet figure reference to a figure
+	${1:Figure}~\\ref{${2:fig:}}
+snippet table reference to a table
+	${1:Table}~\\ref{${2:tab:}}
+snippet listing reference to a listing
+	${1:Listing}~\\ref{${2:list}}
+snippet section reference to a section
+	${1:Section}~\\ref{sec:${2}} ${0}
+snippet page reference to a page
+	${1:page}~\\pageref{${2}} ${0}
+snippet index \index
+	\\index{${1:index}} ${0}
+#Citations
+snippet citen \citen
+	\\citen{${1}} ${0}
+# natbib citations
+snippet citep \citep
+	\\citep{${1}} ${0}
+snippet citet \citet
+	\\citet{${1}} ${0}
+snippet cite \cite[]{}
+	\\cite[${1}]{${2}} ${0}
+snippet citea \citeauthor
+	\\citeauthor{${1}} ${0}
+snippet citey \citeyear
+	\\citeyear{${1}} ${0}
+snippet fcite \footcite[]{}
+	\\footcite[${1}]{${2}}${0}
+#Formating text: italic, bold, underline, small capital, emphase ..
+snippet ita italic text
+	\\textit{${1:${VISUAL:text}}}${0}
+snippet bf bold face text
+	\\textbf{${1:${VISUAL:text}}}${0}
+snippet under underline text
+	\\underline{${1:${VISUAL:text}}}${0}
+snippet over overline text
+	\\overline{${1:${VISUAL:text}}}${0}
+snippet emp emphasize text
+	\\emph{${1:${VISUAL:text}}}${0}
+snippet sc small caps text
+	\\textsc{${1:${VISUAL:text}}}${0}
+#Choosing font
+snippet sf sans serife text
+	\\textsf{${1:${VISUAL:text}}}${0}
+snippet rm roman font text
+	\\textrm{${1:${VISUAL:text}}}${0}
+snippet tt typewriter (monospace) text
+	\\texttt{${1:${VISUAL:text}}}${0}
+snippet tsub subscripted text
+	\\textsubscript{${1:${VISUAL:text}}}${0}
+snippet tsup superscripted text
+	\\textsuperscript{${1:${VISUAL:text}}}${0}
+#Math font
+snippet mf mathfrak
+	\\mathfrak{${1:${VISUAL:text}}}${0}
+snippet mc mathcal
+	\\mathcal{${1:${VISUAL:text}}}${0}
+snippet ms mathscr
+	\\mathscr{${1:${VISUAL:text}}}${0}
+#misc
+snippet ft \footnote
+	\\footnote{${1:${VISUAL:text}}}${0}
+snippet fig figure environment (includegraphics)
+	\\begin{figure}
+	\\begin{center}
+		\\includegraphics[scale=${1}]{Figures/${2}}
+	\\end{center}
+	\\caption{${3}}
+	\\label{fig:${4}}
+	\\end{figure}
+	${0}
+snippet tikz figure environment (tikzpicture)
+	\\begin{figure}[htpb]
+	\\begin{center}
+	\\begin{tikzpicture}[scale=${1:1}, transform shape]
+		${2}
+	\\end{tikzpicture}
+	\\end{center}
+	\\caption{${3}}%
+	\\label{fig:${4}}
+	\\end{figure}
+	${0}
+snippet subfig subfigure environment
+	\\begin{subfigure}[${1}]{${2:\\textwidth}}
+	\\begin{center}
+		${3}
+	\\end{center}
+	\\caption{${4}}
+	\\label{fig:${5}}
+	\\end{subfigure}
+	${0}
+snippet tikzcd tikzcd environment in equation
+	\\begin{equation}
+	\\begin{tikzcd}
+		${1}
+	\\end{tikzcd}
+	\\end{equation}
+	${0}
+snippet tikzcd* tikzcd environment in equation*
+	\\begin{equation*}
+	\\begin{tikzcd}
+		${1}
+	\\end{tikzcd}
+	\\end{equation*}
+	${0}
+#math
+snippet stackrel \stackrel{}{}
+	\\stackrel{${1:above}}{${2:below}} ${0}
+snippet frac \frac{}{}
+	\\frac{${1:num}}{${2:denom}} ${0}
+snippet sum \sum^{}_{}
+	\\sum^{${1:n}}_{${2:i=1}} ${0}
+snippet lim \lim_{}
+	\\lim_{${1:n \\to \\infty}} ${0}
+snippet frame frame environment
+	\\begin{frame}[${1:t}]
+		\frametitle{${2:title}}
+		\framesubtitle{${3:subtitle}}
+		${0:${VISUAL}}
+	\\end{frame}
+snippet block block environment
+	\\begin{block}{${1:title}}
+		${0:${VISUAL}}
+	\\end{block}
+snippet alert alert text
+	\\alert{${1:${VISUAL:text}}} ${0}
+snippet alertblock alertblock environment
+	\\begin{alertblock}{${1:title}}
+		${0:${VISUAL}}
+	\\end{alertblock}
+snippet example exampleblock environment
+	\\begin{exampleblock}{${1:title}}
+		${0:${VISUAL}}
+	\\end{exampleblock}
+snippet col2 two-column environment
+	\\begin{columns}
+		\\begin{column}{0.5\\textwidth}
+			${1}
+		\\end{column}
+		\\begin{column}{0.5\\textwidth}
+			${0}
+		\\end{column}
+	\\end{columns}
+snippet multicol2 two-column environment with multicol
+	\\begin{multicols}{2}
+		${1}
+		\columnbreak
+		${0}
+	\\end{multicols}
+snippet \{ \{ \}
+	\\{ ${0} \\}
+#delimiter
+snippet lr left right
+	\\left${1} ${0:${VISUAL}} \\right$1
+snippet lr( left( right)
+	\\left( ${0:${VISUAL}} \\right)
+snippet lr| left| right|
+	\\left| ${0:${VISUAL}} \\right|
+snippet lr{ left\{ right\}
+	\\left\\{ ${0:${VISUAL}} \\right\\}
+snippet lr[ left[ right]
+	\\left[ ${0:${VISUAL}} \\right]
+snippet lra langle rangle
+	\\langle ${0:${VISUAL}} \\rangle
+# Code listings
+snippet lst
+	\\begin{listing}[language=${1:language}]
+		${0:${VISUAL}}
+	\\end{listing}
+snippet lsi
+	\\lstinline|${1}| ${0}
+# Hyperlinks
+snippet url
+	\\url{${1}} ${0}
+snippet href
+	\\href{${1}}{${2}} ${0}
+# URL from Clipboard.
+snippet urlc
+	\\url{`@+`} ${0}
+snippet hrefc
+	\\href{`@+`}{${1}} ${0}
+# enquote from package csquotes
+snippet enq enquote
+	\\enquote{${1:${VISUAL:text}}} ${0}
+# Time derivative
+snippet ddt time derivative
+	\\frac{d}{dt} {$1} {$0}
+# Limit
+snippet lim limit
+	\\lim_{{$1}} {{$2}} {$0}
+# Partial derivative
+snippet pdv partial derivation
+	\\frac{\\partial {$1}}{\\partial {$2}} {$0}
+# Second order partial derivative
+snippet ppdv second partial derivation
+	\\frac{\\partial^2 {$1}}{\\partial {$2} \\partial {$3}} {$0}
+# Ordinary derivative
+snippet dv derivative
+	\\frac{d {$1}}{d {$2}} {$0}
+# Summation
+snippet summ summation
+	\\sum_{{$1}} {$0}
+# Shorthand for time derivative
+snippet dot dot
+	\\dot{{$1}} {$0}
+# Shorthand for second order time derivative
+snippet ddot ddot
+	\\ddot{{$1}} {$0}
+# Vector
+snippet vec vector
+	\\vec{{$1}} {$0}
+# Bar
+snippet bar bar
+	\\bar{{$1}} {$0}
+# Cross product
+snippet \x cross product
+	\\times {$0}
+# Dot product
+snippet . dot product
+	\\cdot {$0}
+# Integral
+snippet int integral
+	\\int_{{$1}}^{{$2}} {$3} \\: d{$4} {$0}
+# Right arrow
+snippet ra rightarrow
+	\\rightarrow {$0}
+# Long right arrow
+snippet lra longrightarrow
+	\\longrightarrow {$0}
diff --git a/.config/nvim/lua/themes/.gitignore b/.config/nvim/lua/themes/.gitignore
new file mode 100644
index 0000000..dd23724
--- /dev/null
+++ b/.config/nvim/lua/themes/.gitignore
@@ -0,0 +1 @@
+init.lua
diff --git a/.config/nvim/lua/themes/catppuccin.lua b/.config/nvim/lua/themes/catppuccin.lua
new file mode 100644
index 0000000..67ee563
--- /dev/null
+++ b/.config/nvim/lua/themes/catppuccin.lua
@@ -0,0 +1,62 @@
+return {
+  {
+    "catppuccin/nvim",
+    version = false,
+    lazy = false,
+    priority = 1000, -- make sure to load this before all the other start plugins
+    -- Optional; default configuration will be used if setup isn't called.
+    config = function()
+      require('catppuccin').setup {
+        transparent_background = true,
+      }
+
+      local day = 9
+      local night = 18
+      local hour = os.date("*t").hour
+
+      local themes = { "catppuccin-macchiato", "catppuccin-mocha" }
+      local theme = 1
+
+      if day <= hour and hour < night then
+        theme = 1
+      else
+        theme = 2
+      end
+      vim.cmd.colorscheme(themes[theme])
+
+      local function toggletheme()
+        if theme == 1 then
+          theme = 2
+        else
+          theme = 1
+        end
+        vim.cmd.colorscheme(themes[theme])
+      end
+
+      vim.api.nvim_create_user_command("ToggleTheme", toggletheme, {})
+    end,
+  },
+
+  {
+    'nvim-lualine/lualine.nvim',
+    dependencies = { 'nvim-tree/nvim-web-devicons' },
+    init = function()
+      vim.opt.laststatus = 3
+    end,
+    opts = {
+      options = {
+        icons_enabled = true,
+        theme = 'auto',
+        section_separators = { left = '', right = '' },
+        component_separators = { left = '', right = '' },
+      },
+      sections = {
+        lualine_a = { 'mode' },
+        lualine_b = { 'branch', 'diff', 'diagnostics' },
+        lualine_c = { 'filename' },
+        lualine_x = { 'encoding', 'fileformat', 'filetype' },
+        lualine_y = { require('themes.utils').getWords },
+      },
+    }
+  },
+}
diff --git a/.config/nvim/lua/themes/everforest.lua b/.config/nvim/lua/themes/everforest.lua
new file mode 100644
index 0000000..bcdd2f5
--- /dev/null
+++ b/.config/nvim/lua/themes/everforest.lua
@@ -0,0 +1,40 @@
+return {
+  {
+    "neanias/everforest-nvim",
+    version = false,
+    lazy = false,
+    priority = 1000, -- make sure to load this before all the other start plugins
+    -- Optional; default configuration will be used if setup isn't called.
+    config = function()
+      require("everforest").setup({
+        -- Your config here
+        transparent_background_level = 1,
+        background = "medium",
+      })
+      vim.cmd.colorscheme 'everforest'
+    end,
+  },
+
+  {
+    'nvim-lualine/lualine.nvim',
+    dependencies = { 'nvim-tree/nvim-web-devicons' },
+    init = function()
+      vim.opt.laststatus = 3
+    end,
+    opts = {
+      options = {
+        icons_enabled = true,
+        theme = 'auto',
+        section_separators = { left = '', right = '' },
+        component_separators = { left = '', right = '' },
+      },
+      sections = {
+        lualine_a = { 'mode' },
+        lualine_b = { 'branch', 'diff', 'diagnostics' },
+        lualine_c = { 'filename' },
+        lualine_x = { 'encoding', 'fileformat', 'filetype' },
+        lualine_y = { require('themes.utils').getWords },
+      },
+    }
+  },
+}
diff --git a/.config/nvim/lua/themes/gruvbox.lua b/.config/nvim/lua/themes/gruvbox.lua
new file mode 100644
index 0000000..9e85c85
--- /dev/null
+++ b/.config/nvim/lua/themes/gruvbox.lua
@@ -0,0 +1,62 @@
+return {
+  {
+    "ellisonleao/gruvbox.nvim",
+    version = false,
+    lazy = false,
+    priority = 1000, -- make sure to load this before all the other start plugins
+    -- Optional; default configuration will be used if setup isn't called.
+    config = function()
+      require('gruvbox').setup {
+      }
+
+      local day = 9
+      local night = 18
+      local hour = os.date("*t").hour
+
+      local themes = { "gruvbox", "gruvbox" }
+      local theme = 1
+
+      if day <= hour and hour < night then
+        theme = 1
+      else
+        theme = 2
+      end
+      vim.cmd.colorscheme(themes[theme])
+      vim.api.nvim_set_hl(0, "Normal", { bg = "none" })
+      vim.api.nvim_set_hl(0, "NormalFloat", { bg = "none" })
+
+      local function toggletheme()
+        if theme == 1 then
+          theme = 2
+          vim.cmd('set background=dark')
+        else
+          theme = 1
+          vim.cmd('set background=light')
+        end
+      end
+
+      vim.api.nvim_create_user_command("ToggleTheme", toggletheme, {})
+    end,
+  },
+
+  {
+    'nvim-lualine/lualine.nvim',
+    dependencies = { 'nvim-tree/nvim-web-devicons' },
+    init = function()
+      vim.opt.laststatus = 3
+    end,
+    opts = {
+      options = {
+        icons_enabled = true,
+        theme = 'auto',
+      },
+      sections = {
+        lualine_a = { 'mode' },
+        lualine_b = { 'branch', 'diff', 'diagnostics' },
+        lualine_c = { 'filename' },
+        lualine_x = { 'encoding', 'fileformat', 'filetype' },
+        lualine_y = { require('themes.utils').getWords },
+      },
+    }
+  },
+}
diff --git a/.config/nvim/lua/themes/utils.lua b/.config/nvim/lua/themes/utils.lua
new file mode 100644
index 0000000..729a63d
--- /dev/null
+++ b/.config/nvim/lua/themes/utils.lua
@@ -0,0 +1,9 @@
+return {
+  getWords = function()
+    local wordcount = vim.fn.wordcount()
+    if wordcount.visual_words ~= nil then
+      return tostring(wordcount.visual_words) .. "/" .. tostring(wordcount.words) .. " W"
+    end
+    return tostring(wordcount.words) .. " W"
+  end
+}