Hello, please let me find one yaoi. MC (black hair) has transmigrated in a book (I think it was a book), where ML (blond hair) is very cautious of him at first. At the begging ML tried to commit a suicide. I think MC lives with his grandma and has only certain amount of time to save ML by making him happy - as far as I remember, MC gains point by making ML happy and later can detect ML's location. They are both students. ML is an athlete too.
Ohhh boy, poor guy. I am probably bad for saying this but I am glad there was no grape this time....not that getting stabbed is any better.