Kang Jihan, your mothers’ friend’s son, who is so beautiful that he could be mistaken for a celebrity, has excellent grades and a smooth interpersonal relationship, has a secret: he is in a sexual relationship with Ji Jinyoung, a sunbae in his department who he met via a gay dating app. But, as they say, even monkeys sometimes fall out of trees, and after a drunken night out at a department club party, Jihan mistakes the wrong person and ends up sharing an intimate kiss in a back alley with his classmate, otaku Moon Hui-seop. Hui-seop has been stalking Jihan ever since... "Jihan, don't kiss him. You're dating me." Jihan is confused by the nerd's idea that they're dating after just one kiss. Jihan hates men with shaggy hair, ugly checkered coats, and glasses with skin as white as flour. He thought he’d never get involved with Hui-seop, the epitome of a nerd, but when he peeled back the layers, he was an unscratched lottery ticket...!??? Hui-seop's appearance sparks a rivalry with Jinyoung. In the midst of their dizzying relationship, which man will change Jihan's mind?