Han Jae-hee, an actor driven by a desire for his famous father's recognition, contemplates ending his life. On that day, he enters a life-threatening contract with a demon named Kissmoor, also known as K, who takes an interest in him. Jae-hee struggles with intimacy due to psychological reasons. To prepare for a bed scene, he practices with the demon, who has transformed to resemble his co-star, Yoo Sung-woo. However, a misunderstanding leads Jae-hee to become involved with the actual Yoo Sung-woo as well.