When serious and reserved Dunk transfers to a new university mid-semester, all he wants is a quiet place to catch up on his studies. What he gets instead is an outgoing, flirtatious roommate named Joong, the kind of person who turns every moment into a game and never seems to take anything seriously. Thrown together in a tiny dorm room for two, Dunk finds himself constantly tested by Joong's playful teasing and effortless charm. At first, Dunk remains distant, focused only on his work. But as days turn into weeks, he begins to notice that behind Joong's bright smiles and childish energy lies something heavier, a hidden pain the other boy refuses to share with anyone.