Responses
im not sure if this is what youre referring to, but right after reading your question, this manga popped up in my mind...
http://www.mangago.zone/read-manga/back_to_school/
Back to school
Oh god, thanks guys. High schoolers who look like 30+ really do leave a heavy impression (≧∀≦)
Can't recall this manhwa. From what I can remember, first volume is shounen ai. Basically, they're supposed to be high schoolers but the art (bara-ish) looks like they're 30 something y/o. I can also recall it was full of angst