Looking for a Shounen Ai manga but don’t remember what’s it called

I’m having a hard time finding a specific Shounen Ai manga…all I can recall from it was that it was completed and the final chapter had people running inside a building looking for someone, when the guy came into the room, he saw his friend when he was young? (Idk I haven’t read it yet, I accidentally read the last chapter…) The guy he’d found was laying in bed wearing a respirator. Can someone please help me find this manga or manhwa? ╥﹏╥