To get a boy from her past to leave her alone, Kim Yeon Do uploads a photo of a random guy claiming him to be her boyfriend. However, she does not realize the photo she chose was of bad boy student Ji Hyun Ho. When she ends up spending more time with him to make it up, she realizes that people have a lot more to them than what she sees. Adapted from a mobile dating simulation game "Best Mistake" (일진에게 찍혔을 때) by Day7 (데이세븐).