Hitman: Agent Jun

Hiteumaen is a movie starring Jun-ho Jeong, Lee Ji-Won, and Sang-Woo Kwon. While heavily drunk, an unsuccessful comic book writer draws a comic about his life as a former NIS hitman, and runs into trouble when it gets posted online.
A failing webtoon artist finds he's drawn a target on his own back after publishing a story containing real secrets from his former life as a superspy.