I can't remember the name

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