Jin Seon's high school life may seem normal from the outside, but a dark secret hangs over him: his own father is a serial killer! Despite wearing the mask of a philanthropic CEO, Jin's father is a murderous monster who's manipulated his son for years, even forcing him to serve as an accomplice for his crimes. But after his high school crush becomes his father's next target, Jin finds courage he never realized he had. He's determined to grow strong enough to fight back against his father, and with friends backing him up for the first time in his life, he has hope he can outsmart the demon waiting at home. But the world has more than one monster in it, and Jin's father might not be the only killer stalking the streets...