Nicknamed after a human-devouring spirit, the ruthless leader of an overseas black ops team takes up a dangerous mission in a city riddled with spies. Kang In leads a secret NIS operation team in Shenyang, China. His nickname is Yacha, which refers to a fierce ghost who harasses or kills people. Kang In is cold-blooded man. He achieves his objectives by using any means necessary. Meanwhile, Ji Hoon is a prosecutor in the Seoul Central District Prosecutor's Office. He follows the law no matter what. He gets demoted to Shenyang, China. There, Ji Hoon comes up against Kang In.