This example shows how you can write in Korean (Hangul) characters in LaTeX with the CJK package, and particularly the CJKutf8 style. The CJK package is a modern alternative to the older HLaTeX (and hangul.sty) packages, with support for pdflatex and unicode.
Use the psfrag package to replace strings in EPS images, so that they are typeset with the same body font as your LaTeX document. Note that your project needs to be compiled with the LaTeX dvipdf engine. To configure this, after creating a new project, click on the Overleaf menu icon above the file list panel, and make sure the "Compiler" setting is set to "LaTeX". (The sample image is taken from the psfrag package.)