I really like romance with delinquents.
Examples
Really like school 2013 with the hinted romance with the main guy and girl
Also in monstar with the cool guy and nana.
Oh and main male mc
Has to be NON of these
- childish
-playboy
The best drama that I could think of and it perfectly suits your description is: Yankee-kun to Megane-chan; it's a school drama with delinquents and some romantic moments thrown every once in awhile but it doesn't focus on romance.