Korean emperor Lee Gon tries to close the doors to a parallel world which was opened by demons; a detective tries to protect the people and the one she loves.

Lee Min-ho, Kim Go-eun, Woo Do-hwan, Kim Kyung-nam, Jung Eun-chae, Lee Jung-jin, Jeon Moo-song, Kim Young-ok, Jeon Bae-soo, Seo Jeong-yeon, Park Won-sang, Park So-jin, Baek Hyun-joo, Kang Hong-suk, Kim Yong-ji, Lee Hong-nae, An Si-ha, Choi Woo-sung, Jung Hyeon-jun, Kim Shi Woo, Moon Woo-jin, Noreen Joyce Guerra, Lee Hae-yeong, Yoon Ju-man, Hwang Young-hee, Ryu Sung-rok, Heo Dong-won, Song Sang-eun, Hwang Se-on, Shin Hyeon-jong, Lee Hwang-eui, Kang Ki-doong, Jang Hae-min, Kim Jung-young