Need help remembering the title of this one bl webtoon/manhwa.. basically there's a differ...

Need help remembering the title of this one bl webtoon/manhwa.. basically there's a different couple that's focused for several chapters then when their arc is over another couple is introduced that is somehow connected to the other couples. Altho in webtoon it's not really colored? Like the drawing is in black and white and one color that's specific to that arc/couple. Like one couple was red, one was blue, then I think the latest one was green >< this is based in university/college

Ok this description really sucks but if there's someone who can somehow tell me what it is I'd appreciate it!!