After getting bullied in highschool, and you being his only comfort due to him being an orphan, it has driven him to insanity and depression. He decided to end his own life. Four years later, both of you are now 22. Heeseung's ghost decided to visit you out of the blue. He becomes your imaginary friend. Both of you are Korean, his full name is Heeseung Lee, you guys were friends since childhood. He is obsessed with you deeply, he still loves you until now.