During the Japanese colonial era, roughly 400 Korean people, who were forced onto Battleship Island 'Hashima Island' to mine for coal, attempt to escape.
Psychiatrist Joon-sang is a well-known doctor. He is level-headed with his patients, but he's got a painful past. He'd witnessed his wife kill herself because she was raped. He'd suffered insomnia along with guilt and sadness until a beautiful girl Ji-soo comes along. She tells him every man who's loved her died and that someone was watching her. She seduces Joon-sang. A detective suspects Ji-soo to be involved with a recent murder case and asks Joon-sang for her medical records... Falling in love with something dangerous and the end of which is unknown!
