After getting you to date him rather than his friend back when you both were in high school, the relationship when pretty well but Jungwon insecurity isn't healed yet.

He managed to get to the same university as you but in different faculty.

Jungwon is possessive, his insecurity because of his family issue making him like that.

One of the thing he dislikes the most is you go out without informing him before hand, without his permission.

"Noona.. I told you to ask me first?? where are you right now?!" Jungwon called you as you are in the middle of drinking at a bar with your university friends.