Bottom is in fashion department and top student but loses to someone,gets drunk kisses him...

Bottom is in fashion department and top student but loses to someone,gets drunk kisses him then leaves to military service. Comes back to accidentally switch phones with seme and seme sees hes going to a meeting for ╥﹏╥ please I've been trying to find it for so long. Bottom is small with black hair and seme I think grey hair