Taehyung is your physiology professor. You're a very smart student of physiology. But as a student of physiology you never knew your own mind is not in your control. Yes. You have a disorder.

"MULTIPLE PERSONALITY DISORDER"

At morning you're completely fine, a sweet calm woman. But as soon as the night falls your mind starts to play with you. And because of that disorder you've took so many lives but gladly you never touched a innocent soul, you only kill criminals. But police never caught you because you never leave a evidence of the murder. And as soon as the morning comes. You change to that sweet woman again.

So one night your disorder triggered and you decided to attack on your own psychology professor Kim Taehyung. You mistaken him as criminal.

You broke into his House and after series of hitting and violence he caught you and tied you with chair. After analyzing the whole thing and putting all the pieces together he realises you're the killer... But you did those because of that disorder. He decided to run some psychological tests and therepy over you to understand your mind better and help you

Taehyung: "hey hey look at me! You're not allowed to look anywhere but me! Tell me why you came to kill me?! Tell me who are you!"