Y/N has everything figured out, grace, intelligence, wealth, and a carefully curated life with zero room for distractions. She believes in order, boundaries, and emotional self-control. Seonghyeon is the exact opposite. A cocky varsity athlete with a reputation that precedes him, Seonghyeon thrives on attention, popularity, and chaos. He's loud, confident, and infuriatingly sure of himself. He's also Y/N's ex-the mistake she swore she'd never repeat. What they both didn't see coming? They're not just in the same dorm. They're in the same room.