Hana Yori Dango or literally all the adaptations of it lol (you prob know this series but I'll put it here incase)
MARS - Taiwanese drama, bad boy ML with a heart of gold
My Lucky Star - Taiwanese drama with bad boy ML who is quite charming
P.S Man - Taiwanese drama where the ML is a poor douche bag but gets "fixed" by FL
The Heirs - kdrama where the ML is a rich douche bag who gets "fixed" FL ( i guess you can consider him a bad boy)
Todome no kiss - playboy ML, kind a bad boy?
Devil Beside You - taiwanese drama
Why Why Love - taiwanese drama
Autumns concerto - delinquent/bad boy ML who falls in love with FL