Trigger

When a shocking mass shooting shatters Korea's calm, Lee Do races to stop the violence — then realizes the threat of illegal guns is just beginning. (Source: Netflix)

As shootings spread, Lee Do discovers guns in the hands of everyday citizens. When a victim hits close to home, his investigation grows more urgent. (Source: Netflix)

A police raid uncovers a cache of military weapons. Lee Do and his new ally Moon Baek close in on the arms network as the city reels from bloodshed. (Source: Netflix)

Lee Do confronts a violent standoff and must decide how far to go to stop the killings, while suspicions about Moon Baek threaten their fragile alliance. (Source: Netflix)

Guns reach bullied students and grieving parents, sparking new tragedies. Lee Do uncovers a network delivering weapons to vulnerable people across Korea. (Source: Netflix)

A gun in the hands of a student spells crisis at school. As panic spreads, Lee Do and Moon Baek race rush to restore order — but it may be too late. (Source: Netflix)

As fear and confusion grow, police and gangs rush to recover illegal guns. Lee Do feels powerless as the true scale of the arms crisis comes to light. (Source: Netflix)

Police raid the gun syndicate, and rival gangs and old enemies clash in bloody battles. Lee Do is pushed to the limits as violence hits all of Korea. (Source: Netflix)

As guns reach new hands and fear sweeps the nation, Moon Baek's message echoes through the media. Across Korea, people must choose how to respond. (Source: Netflix)

With emotions running high, Lee Do and Moon Baek move toward a crossroads. One final choice will shape Korea's future — or plunge it into darkness. (Source: Netflix)