Kill Boksoon

A renowned contract killer who leads a quiet domestic life between missions. She operates by her own brutal code, balancing deadly efficiency with a stubborn loyalty to her daughter. Her tactical ruthlessness is counterbalanced by a deep maternal instinct that drives her to protect Jae-young at all costs.

Bok-soon's daughter, a perceptive teen who challenges corruption and rules. She reveals a lesbian relationship with So-ra, adding tension to family dynamics. Her impulsive act of stabbing a classmate tests her mother's capacity to shield her, while her later calm demeanor hints at growing resolve.

The agency director who assigns assignments and pressures operatives to perform, often blurring ethical lines. He grows suspicious of Bok-soon's failure, driven by a desire to secure power and maintain control over his agents.

Min-hee, Min-kyu's sister, manipulates events to secure her own position and tries to kill Bok-soon. Her betrayal reveals a scheming faction within the agency, where ambition overrides loyalty.

A fellow assassin whose actions are revealed to be coerced into betraying Bok-soon. His fate underscores the brutal atmosphere where loyalty is transactional and survival is paramount.

Bok-soon's intern who survives the fallout of the agency's machinations. Her presence exposes the cost of corruption and the precarious position of operatives who work behind the scenes.

A second-generation yakuza rival who confronts Bok-soon on a bridge, testing her resolve and signaling the global reach of the corrupt network around her.