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A crime-action drama that tells the journey of police officer Kang Joon Mo as he goes on an undercover mission to take down a major drug operation based in Gangnam, the center of drug trafficking between Korea, China, and Japan during the 1990s.
Gi Cheul and Joon Mo make their way to the final deal. Korea, China, and Japan prepare for the arrest.
An accident halts the trade and a crisis approaches as Eui Jung and Do Hyung worry about Joon Mo.
Joon Mo and Eui Jung juggle duty and feelings. Hwang continues to meddle, and the final day arrives.
The battle with Jaegeon creates a crack. Joon Mo joins forces with Hae Ryun to resume the trade.
Gi Cheul suspects Joon Mo. The four people's irreversible decisions trigger the biggest crisis.
Hae Ryun shows interest in Joon Mo and Eui Jung approaches Gi Cheul. Joon Mo takes an extreme measure.
The delivery accident jeopardizes the trade. Detective Hwang closely surveils Gangnam Union.
Earning Gi Cheul's trust, Joon Mo becomes anxious as he sees Gi Cheul making a move towards Eui Jung.
The team seeks Eui Jung's aid to assist Joon Mo in a crisis, which leads to a perilous love triangle.
The team seeks Eui Jung's aid to assist Joon Mo in a crisis, which leads to a perilous love triangle.
Barely passing Gi Cheul's test, Joon Mo joins Gangnam Union and discovers an unexpected truth.
Detective Joon Mo goes undercover within Gangnam Union to probe an international drug trade.