While Korea is occupied by the Japanese Army in 1933, the resistance plans to kill the Japanese Commander Kawaguchi Mamoru along with a pro-Japanese businessman named Kang In-guk. The resistance agent Yem Sek-jin assigns this mission to the only sniper who is able to make that shot, Ahn Ok-yun, who travels to Seoul along with her team. What they don’t know is that they have a traitor in their midst.