Based on the stage musical of the same name [ko], the film follows the true story of An Jung-geun, a Korean-independence activist who assassinated Itō Hirobumi, the first Prime Minister of Japan and Resident-General of Korea in 1909.

[3][4] Leaving his mother, Jo Maria [ko], and his family behind, An Jung-geun, the leader of the Korean righteous army, departs his hometown.

Sworn in blood, he vows to assassinate Itō Hirobumi, the mastermind behind Japan’s invasion of Joseon, within three years or take his own life if he fails.

Alongside his longtime ally Woo Deok-soon, sharpshooter Cho Do-seon, the youngest member of the independence army Yoo Dong-ha, and comrade Ma Jin-joo, who cares for the troops, he begins preparations for the mission.

Risking her life to gather information deep in enemy territory, she urgently relays a top-secret report that Hirobumi will soon visit Harbin for a meeting with Russia.