Set in the 1930s during the Japanese occupation of Korea, a group of resistance fighters plots a daring assassination against top Japanese officials and a pro-Japanese Korean collaborator. Trained sniper Ahn Ok-yun is broken out of prison by Yem Sek-jin, a fellow resistance member, and assigned to lead the mission. The team, consisting of Ahn, explosives expert Hwang Deok-sam, and gunman Chu Sang-ok, faces multiple challenges, including evading capture by both Japanese forces and spies within their own ranks. Separated at first, they eventually regroup to coordinate their efforts and develop a complex plan to strike back against the occupying forces.

As the team navigates through layers of deception, betrayal, and unexpected alliances, Ahn's determination is tested by personal and professional stakes. Paranoia grows as the resistance fighters clash with various adversaries, including the infamous contract killer Hawaii Pistol. Their mission becomes even more perilous with every step closer to their target, underscored by intense action sequences and emotional turmoil. Tensions rise as the clock ticks down, leaving everyone questioning the loyalty and motivations of those around them.