David Jung, a Korean-American man who faked his death nine years ago, confronts his past when his daughter Rebecca, now working as an assassin for the private intelligence agency Caddis, is sent to kill him.

Rebecca, David and his family escape to a safe house in the coastal city of Busan. Family tensions mount as Rebecca struggles with her father's new family. And a shocking revelation about David's past with Juno is revealed during a violent confrontation at a marina.