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