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. Watch drama online for free.