\documentclass{article}
\usepackage{amsmath,amssymb}
\usepackage[hangul]{kotex}
\usepackage{kotex-logo}
\usepackage{iftex}
\ifPDFTeX
\usepackage{dhucs-nanumfont}
\else\ifXeTeX
\setmainhangulfont[Ligatures=TeX]{HCR Batang LVT}
\setsanshangulfont[Ligatures=TeX]{HCR Dotum LVT}
\else\ifLuaTeX
\setmainhangulfont[Ligatures=TeX]{HCR Batang LVT}
\setsanshangulfont[Ligatures=TeX]{HCR Dotum LVT}
\fi\fi\fi
\begin{document}
\title{\koTeX-article 템플릿}
\author{저자}
\date{}
\maketitle
\section{절 제목}
\subsection{소절 제목}
이 문서는 \koTeX\ 문서입니다.
\end{document}