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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.
Seasons
Episode 1
Episode 1
39m
Q meets X and is challenged to beat him in 21 days—sparking rivalry and unexpected bonds.
Episode 2
Episode 2
38m
After X’s injury, Q tends to him closely, giving them a chance to see each other differently.
Episode 3
Episode 3
44m
As their days together grow, Q’s feelings shift, and mutual understanding slowly deepens.
Episode 4Latest episode
Episode 4
40m
At a turning point, Q and X must face whether the “21-day theory” will define their future.
