Web novels in South Korea have been growing in popularity in the 21st century. Among e-publishing fields, web novels are the core contents that are leading the e-book market. Just as webtoons grew in the early 2000s in South Korea, web novels have been growing rapidly since 2010.

Mr. Back is a South Korean television series based on the web novel Old Man (Korean: 올드맨), which was serialized on KakaoPage from April to October 2014. It starred Shin Ha-kyun, Jang Na-ra and Lee Joon. The series aired on MBC from November 5 to December 25, 2014, for 16 episodes.