Set during the Japanese colonial era on Hashima Island, a coal mining island using forced labor from Korea and China. 400 Koreans attempt to escape, including a musician trying to protect his daughter, a street brawler and a Korean independence fighter. Lee Kang-Ok is a bandmaster at Kyungsung Hotel. He decides to go to Japan to protect his daughter, but he is drafted into Battleship Island by force, being deceived by talk to send him to Japan. On Battleship Island, he does anything to protect his daughter. Choi Chil-Sung is the top fighter in Kyungsung (old name of “Seoul”). He makes troubles on Battleship Island, but he has a warm heart. Park Moo-Young belongs to the Korean Independence group. He sneaks onto Battleship Island to rescue a member of the independence group.