In recent years, the story lines of popular webtoons, or web cartoon series published online, have been the to-go choice for filmmakers when they find themselves short of fresh material to put on the big screen.
However, using webtoons as a major source of films is considered a double-edged sword. The films are easy to publicize, but they have a high risk of becoming box-office failures if they can't provide viewers with something more than the original webtoon.
A webtoon titled "A.P.T", written by first-generation webtoonist Kang Pool, was the first to be made into a horror movie of the same name, starring Ko So-young as the lead actress in 2006.
Kang Pool, whose real name is Kang Do-young, has written numerous cartoon series online covering diverse genres such as humanism, thrillers and horror