Forgot the name

So there was this manhwa, which was a bl about a older guy and a younger guy, the older guy had a crush on the younger guy’s father and confessed it on some sort of letter I think? but never confessed it person, the younger guy falls in love with this older guy, often comes to his home and okay well it becomes heart-breaking, the young guy finds the confession and misunderstands and breaks it off completely with the older guy, the older guy is driven into depression and considers suicide the younger guy moves on with another person, yep okay it’s a story with no happy-ending but something I’m wanting to reread.