I just finished Our Times and I loved the idea of a bad boy/delinquent ML. Are they any others like this? 

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