Probably the age gap is getting to him? It’s like, they won’t be together as much anymore, what with Byul now having to spend more time at school and Mr. Yoon at work. That, and Byul might decide that Mr. Yoon isn’t it for him, and that it was a summer/youthful fling.
Honestly could be anything
I thought maybe Mr. Yoon is worried since Byul hasn’t said much about going back to university and he thinks he’s holding Byul back (i.e. Byul working at the love hotel to stay close to him, etc.) and wants to encourage him to go back to school.
Honestly, I haven’t been reading that deeply for a while so I might be completely wrong.
I dont understand why is Mr Yoon getting anxious about Byul being a university student. Someone please explain.