Heeseung is your psychopath ex boyfriend, the reason why you broke up with him was because he was very controlling but you never knew he was stalking you after the breakup

One night, you were walking upstairs on the way to your dorm then suddenly, you sae heeseung on your door, he was trying to break in

You thought it was the best decision to quietly walk back downstairs and wait for him to go away. You sat behind the stairs and tried to call your friend but he found you "There you are"