Kim Doyoung is a nerdy high school student who harbors feelings with Jung Jaehyun, one of the hottest guys in their school. Doyoung decides to confess his feelings for the guy, only to be befuddled by one obstacle: Jaehyun doesn’t know he exists (or so what Ten and Yuta think). The trio stumbled upon a centuries-old potions book among Taeil’s many collections, and they decide to give it a try. Jaehyun and Hansol, his friend, took the potion to everyone’s surprise, and goes up and down from there.