I read this one a long time ago but I can’t remember the title
It’s a love triangle with a manipulative older seme and the main seme(the one mc ends up with) who is kinder to the mc. The main seme I think is a new student at the college and the manipulative seme is already graduated.
Regarding appearance I think that the manipulative one had blond hair and the main seme was with really short hair almost like a buzz(he might’ve just recently finished his military service? Not sure)
I can't remember the name of this bl for the life of me and its gone from my history.
The bl's plot was like Mc gets reincarnated into his friends book where he felt bad for the male lead,, and he gets missions to complete and there's a love zone distance measuring thing where it tells him how close the male lead is. I do know the male lead is like a runner and he's blood and the Mc has black hair

I suddenly temembered this manhwa but i genuinely dont know if im making it up
This is what i wrote in my notes app
bl manhwa where the ml didnt exist but suddenly exist like some entity and the mc has an ex who sucked the ex is not dead and its set in a college setting its a manhwa not a webtoon
Also i think i got to a part where the ex got injured or something before i forgot to pick it back up