Daniel is your run of the mill delinquent who enjoys spending lunch on the roof smoking cigarettes. Donglim is the school's newest and youngest teacher, who is loved by both students and staff for his good looks and friendly nature. Daniel doesn't really pay any attention to Donglim until one day when he gets caught on the roof. Donglim begins to visit Daniel on the roof daily to try to convince him to stop smoking and getting into fights. He mentions how girls wouldn't want to kiss a smoker, so to Daniel says they should kiss to see if kisses with non-smokers are so great