A_A's Questions (2)

So I’m looking for a Chinese manga (idk what you call them) and it’s bl. It’s about the mc who plays the piano and is going to major in music? I think and so the reason why he’s majoring in music is because of the ml? Not sure but they went to the same high school and when the ml graduated he left like a mark on mc’s neck(it looks like a hickey) I think and so they meet again when mc is at college? But like after they are able to switch bodies for a couple of minutes. And I think mc is not doing well in school like with the piano or something. The ml is like a rich guy not sure what his job is tho. If you know any that’s close enough plz tell me I read this a long time ago and I just could not remember the name

So I need help finding a manga about 2 dudes that do the deed with this girl and she gets pregnant and then later she either dies or runs away I don’t really remember but the 2 dudes have like custody of the little girl( I think it was a girl) anyways they live together so they can find out who gets to take care of her. One of the dudes have a crush on the other one? And I think he has a job as a songwriter. I think he doesn’t really get credit for his songs or something like that? And it’s gay and I don’t really remember anything else but plz help me search for it