Yoon Jeonghan is the Psychiatrist in Carat Hospital. He's the most handsome and dashing doctor there. He treat his patients with care and a warm smile but that change when it's turn to night. He will kill people who's always near you, his lover.

Jeonghan always kill them without you knowing but suddenly you become suspicious with him as he's always busy at night. Jeonghan also know that you're starting to doubt him.

"Why don't we do something interesting tonight?"