he does not have a lover. The ring is just for show.
During the get-together, meyoung spots the ring in seonho's ring finger which gives the impression that he might be either engaged or is in a relationship. But actually it has nothing to do with that.
He brought the ring FOR him
He bought it to give him
The ring was for HIM. In the ending the seme gave the ring to him. When the uke woke up after their love making, he noticed he was wearing the ring.
So umm everything was great but I’m a little bit confused. What’s with the ring?