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Episode 1
Episode number: 1
Overview: Detective Jun-mo goes undercover within Gangnam Union to probe an international drug trade.
Episode 2
Episode number: 2
Overview: Barely passing Gi-cheul's test, Jun-mo joins Gangnam Union and discovers an unexpected truth.
Episode 3
Episode number: 3
Overview: Eui-jeong's appearance puts the squad in trouble. Gi-cheul finds last night's attack suspicious.
Episode 4
Episode number: 4
Overview: The team seeks Eui-jeong's aid to assist Jun-mo in a crisis, which leads to a perilous love triangle.
Episode 5
Episode number: 5
Overview: Earning Gi-cheul's trust, Jun-mo becomes anxious as he sees Gi-cheul making a move towards Eui-jeong.
Episode 6
Episode number: 6
Overview: The delivery accident jeopardizes the trade. Detective Hwang closely surveils Gangnam Union.
Episode 7
Episode number: 7
Overview: Hae-ryun shows interest in Jun-mo and Eui-jeong approaches Gi-cheul. Jun-mo takes an extreme measure.
Episode 8
Episode number: 8
Overview: Gi-cheul suspects Jun-mo. The four people's irreversible decisions trigger the biggest crisis.
Episode 9
Episode number: 9
Overview: The battle with Jae-geon creates a crack. Jun-mo joins forces with Hae-ryun to resume the trade.
Episode 10
Episode number: 10
Overview: Jun-mo and Eui-jeong juggle duty and feelings. Hwang continues to meddle, and the final day arrives.
Episode 11
Episode number: 11
Overview: An accident halts the trade and a crisis approaches as Eui-jeong and Do-hyung worry about Jun-mo.
Episode 12
Episode number: 12
Overview: Gi-cheul and Jun-mo make their way to the final deal. Korea, China, and Japan prepare for the arrest.