Bang Myung-soo is a popular writer of webtoons. Soo-Jin is a producer. Her company decides to make a film based on a popular webcomic by Myeong-Soo’s. The webcomic is about Myeong-Soo';;s ex-girlfriends. It just so happens, Soo-Jin is also an ex-girlfriend of Myeong-Soo. Now, Soo-Jin has to interact with her ex-boyfriend and his 3 ex-girlfriends: Hwa-Young, Ji-A and Ra-Ra.