Mantis, an ace assassin, returns to the contract killer industry after a hiatus, encountering his trainee friend Jae-yi and a retired legendary killer Dok-go, who now runs the organization.

When hijackers seize a Japanese flight and demand to fly to Pyongyang, a mysterious mastermind hatches a zany scheme to reroute the plane to Seoul.

Su-young, a police detective who went to prison for someone else, is surprised when a mysterious woman named Yoon-sun arrives to collect her on her day of release. As she…