Du Ah is a college student who currently has three boyfriends. To her, it’s the most natural thing in the world since each of them serves his own purpose. However, someone posts a picture of Du Ah on the school’s online community forum and threatens to reveal her identity as a three-timer. Du Ah’s three boyfriends are now under suspicion.

All three of Du Ah’s boyfriends and Han Wool finally meet to figure out who wrote the post online, and all four of them suspect each other. Du ah thinks it is Han Wool who wrote the post as the photo was found on his tablet PC but, he denies it. Han Wool and Du Ah hurt each other by saying mean words out of anger. Meanwhile, Da Ham, Sang Woo, and Si Han try to take revenge on Du Ah for cheating on them.