고민하실 거 없고요, 그냥 해보시면 되는데...

\begin{paracol}{2}
\section{소개}
\jiwon[1-3]
\switchcolumn
\section{Introduction}
\lipsum[1-3]
\switchcolumn*
\section{본문}
\jiwon
\switchcolumn
\section{Main body}
\lipsum
\end{paracol}