yes he did, he was dying of an illness and was put on life support, but then one day when dojoon (ML) came to visit him in the hospital he begged him to remove tge cable from his life support bc ge was the only one he could trust. thats why silver haired guy calls dojoon a murderer. silver haired guy sees only the tutor yesung in our mc, thats why he calls him hyung and not by his actual name.
we're actually getting closer to the ending, in the end silver haired guy tries to kill MC by throwing him onto the road when he is confronted (if i cant have u noone can mindset) but mc fights back and dojoon fucks him up. then mc is transported back to his own world but he misses the lottery ticket claiming by one day. he is devastated about dojoon bc he misses him, and while wandering i dont remember but he meets dojoon who is a ceo or smth and then stuff happens and they fuck
thank you for the spoiler, the way the story keeps going back and forth with ML and 2nd ML seeing MC in completely different POV as a person is making us confused AF. Also, who's the person that gave him the book at the start? I had a feelings it's definitely one of the two MLs since it felt intentional
honestly its a but confusing for me too, the only reason i can understand what happened is because i read the novel lol. also, im pretty sure that that was the ML. thing is, after mc returns back to his original world, after meeting ML, ML says that he has been waiting for 12 years. that meand that mc went into the past, and not got reincarnated into a book. the book was just a vessel.
this is just a theory but ML gives him the book because MC doesnt remember anything about his school life, and that also means he doesnt remember ML. so giving him that book meant that he wouldve travelled into the past, regained his memories and would remember ML again. actually its very confusing and the plot holes are evident but overall its a very good ans funny story since the main focus is romance and comedy.
it's kinda evil to ask a 15 yo to remove you from life support, their brains are not fully developed, even with the kind of personality they have now, you don't know if they'll end up blaming themselves for your death later on. like I get that you're in so much pain but hell I'm not cutting him any slack for that

I think tutor falls for ML (weird since it states tutor is 22 and they are 15) and white hair use MC as stand in while ML truly didn’t care for that tutor but is interested in MC