# ctex package and indentation

It seems that ctex package by default indents the first paragraphs. The issue can be solved with \noindent, but I would like to restore the default settings for which after a heading no indentation occurs. Here is a MWE:

% !TEX encoding = UTF-8
% !TEX program = xelatex
\documentclass[12pt,english,openright,twoside,a4paper]{book}%
\usepackage[UTF8]{ctex}
\begin{document}
\chapter{First chapter}
I wonder why this paragraph is indented.
\end{document}


The issue occurs both compiling with pdflatex and xelatex. I found on the web that someone had a similar problem with xeCJK and solved it by loading polyglossia with some options, but in my document polygloxia clashes with other packages.

The question is, if I load ctex package how can I avoid the indentation of the first paragraphs?

• Because in Chinese typesetting, the first paragraph is conventionally indented, just like in English typesetting, it is not. – L. F. Feb 24 at 3:33

\usepackage[UTF8,noindent]{ctex}
%%%%%%%%