Gokusen

Class 3-D (3-nen D-gumi) is the notorious homeroom class of delinquent and rebellious high school boys assigned to Kumiko Yamaguchi ("Yankumi") across all three seasons and adaptations of the hit Japanese media franchise Gokusen. Yankumi is an idealistic math teacher who secretly hides her identity as the granddaughter of a powerful yakuza boss (Now about you) Your name is Min-jun and your somehow almost sleeping all the time or barley awake and everyone in the class is your friend goodluck