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.  …

Seok, an eager yet genius neurosurgeon is reunited with Deokhee, the professor who ruined her life long ago. Once, the two surgeons cared for each other more than anyone else….

Jae-ho, who aims to become the number one in a crime organization, gets to build up trust with Hyun-su, an ambitious newbie in the prison. While they try to take…