Responses
perhaps it's never understand or back to school?
the one i remember that fits this is never understand/out of control
http://www.mangago.zone/read-manga/never_understand/
Could also be this? http://www.mangago.zone/read-manga/itonaga_kun_no_koi_no_ito/
i feel like it's restless http://www.mangago.zone/read-manga/restless/
it's a bl manhwa. The main character is a pushover that got bullied in highschool.
one of the bully felt pity for him and they got close. eventually, they fell in love.
the bully is not a hardcore one. he's just a bystander. I'm not sure if he's the male lead or not.
I remember one scene where they kissed in an empty classroom and one of their classmate saw it and spread the rumors.