Manhwa

Hi! Can you guys help me find a manhwa, its about an Uke and Seme matched in a dating app, but turned out that the seme is actually a developer/teacher in the univeristy that uke is in, and became obsessed with the uke, so much that he moved to the adjacent building where he can observed the uke better. Though one thing led to another, the uke wanted to break up with the seme but he (seme) made sure that he (uke) won't meet anyone in that app...and yeah one thing led to another they meet and thing happen