Searching for a manhwa

Hi
I'm searching for a bl manhwa I've read a long time ago. It should be completed and have a lot of chapters
I don't remember much but I remember that it wasn't set in a modern setting
The seme was really obsessed with the uke
I remember that the uke and sème get separated for some reasons, the seme
search for him, they meet again and have sex, but the uke has to leave again so he leaves a note but the seme doesn't see it and search for him