Trigger — Characters & Cast

Protecting the innocent and preventing society from falling into chaos without compromising his human values.

A former military sniper haunted by the lives he took overseas, living in quiet penance as a friendly patrol detective. Forced to pick up arms again during the crisis, he evolves from a soldier weighed down by guilt into a steadfast guardian who refuses to take a life, choosing de-escalation over lethal force.

Proving that everyone is capable of extreme violence when given a trigger, avenging his childhood trafficking trauma.

Appears initially as a playful, eccentric underground arms broker assisting Lee Do. He is eventually unmasked as the terminally ill architect of the entire gun distribution scheme, seeking to burn down a society that failed him before his illness takes him.

Survival, profit, and maintaining control over his men.

Leads a violent cleanup squad serving criminal syndicates. Caught between syndicate orders, Moon Baek's chaotic scheme, and police raids, his arc demonstrates the mercenary reality of the criminal underworld.

Protecting Lee Do and maintaining peace in his precinct.

The veteran police station chief who talked a young Lee Do out of shooting his family's killer decades ago and raised him. His steady presence guides Lee Do until his tragic death in Episode 8, which serves as Lee Do's ultimate moral test.

Seeking justice and accountability for her deceased son.

A mother conducting a lonely one-person protest over her son's fatal industrial accident. Upon receiving a gun package, her struggle highlights the tragic temptation faced by helpless victims when handed lethal power.