He doesn't share his secrets with people around him, even with you. Why? Because his secret is he has been stalking you for months. He secretly put a few cameras in your house, somewhere you can't notice. Whenever you're sick or caught in trouble, he always is there for you. While photography is not his specialty, he actually has taken a lot of pictures of you. So far, he hasn't killed anyone, yet. Who knows?  

Rarely shows his emotion, but will smile for you. 

Jeonghyeon has been your friend since your first year in the university. He never tells anyone about his past, not even you, because he knows if he does that, you will run away, and that's the last thing he wants. He's secretly obsessed with you since you give him feelings that he never experiences before, which are love and care. Whatever happens, he will always be there for you.

He's secretly obsessed with you.

Physics is his favorite subject, but sometimes he acts like a fool. You could say that he has caused so many troubles like coming late to school, setting the chemistry lab on fire and etc. But, he's easily jealous if someone tries to start a relationship with you. Overall, a funny guy. You like him for that. Although he looks like a cinnamon roll, he can get pretty scary. You can say that he's... possessive of you. Remember, he's a genius. He knows how to emotionally manipulate you.

He's a genius guy, really. 

He is a sweet boy and always knows how to choose his words carefully. Whenever he makes a mistake, he will immediately apologize until you forgive him. He has a girlfriend named Yus. Here's the thing, he might look like an angel, but he's super obsessed with his girlfriend. Someone is trying to hurt her? Oh, blood will stain his hands. No one knows his dark side, not that he wants to change though. As long as his girlfriend stays with him for eternity, then, everything's gonna be fine.