A superhero drama about Soo-yeol who has lived his whole life as a materialistic police detective, but changes into a champion for justice and fights against police corruption when a hidden persona called "K" awakens inside him.

Lee Dong-wook, Wi Ha-jun, Han Ji-eun, Cha Hak-yeon, Kang Ae-sim, Kim Dae-gon, Cha Si-won, Lee Sang-hong, Kim Hieora, Lee Seung-heon, Sung Ji-ru, Lee Jin-hong, Lee Hwa-ryong, Shin Ju-hwan, Cho Dong-in, Won Hyun-jun, Im Gi-hong, Park Se-jun, Choi Kwang-je, Han Gi-joong, Yoo Jeong-ho, Jung Sung-il, Kim Jung-hoon