Oh definitely
It's obvious that they were last lovers
*past
Isn't he married
Who? The brother? you can literally see the doctor saying that there's no one to take care of him cuz he has no lover and if you mean the uncle there's nothing mentioned about him being married.
Uncle having a cat? Definitely a single one. So yeah, brother and uncle are both single
i have a bachelor's degree in yaoitology and analytics and i can vaguely see that mc's hyung and ml's uncle will def fuck