21 Days Theory

Season 1

A playful rivalry turns into something more when a cocky senior dares his classmate to win the school’s top celebrity’s heart in just 21 days.

Episode 1
E1
Episode 1Q meets X and is challenged to beat him in 21 days—sparking rivalry and unexpected bonds.
Episode 2
E2
Episode 2After X’s injury, Q tends to him closely, giving them a chance to see each other differently.
Episode 3
E3
Episode 3As their days together grow, Q’s feelings shift, and mutual understanding slowly deepens.
Episode 4
E4
Episode 4At a turning point, Q and X must face whether the “21-day theory” will define their future.