Plot Analysis Summary
The single-season narrative follows an undercover investigation into an international drug trade. Its central progression moves from infiltration and trust-building to personal entanglement, operational collapse, and an international arrest attempt.
Story Structure — 5 Plot Phases
Infiltration and Entry
The investigation begins with an undercover mission inside the Gangnam Union. The detective barely passes the entry test and discovers an unexpected truth after joining the organization.
Key Events
-
Undercover Mission Begins — A detective goes undercover inside the Gangnam Union to investigate an international drug trade.
-
Gang Entry Test — The undercover detective barely passes a test and gains entry into the criminal organization.
-
Unexpected Discovery — After joining the Gangnam Union, the detective discovers an unexpected truth.
Personal Complications
The investigative squad comes under pressure after a woman's appearance complicates the operation. A dangerous love triangle begins to overlap with the undercover mission.
Key Events
-
Squad Under Pressure — A woman's appearance places the investigative squad in trouble, while an attack is judged suspicious.
-
Aid During Crisis — The team seeks the woman's assistance to help the undercover detective during a crisis.
-
Love Triangle Emerges — The crisis develops into a perilous love triangle involving the undercover operation.
Trade Under Surveillance
The undercover detective gains the criminal leader's trust while growing anxious about the leader's interest in the woman. A delivery accident threatens the international trade, and surveillance becomes more intense.
Key Events
-
Trust and Jealousy — The undercover detective earns the criminal leader's trust but becomes anxious as the leader moves toward the woman.
-
Trade Delivery Accident — A delivery accident jeopardizes the international drug trade, while surveillance of the Gangnam Union intensifies.
-
Extreme Measure — Interest from another participant and a new approach toward the woman push the undercover detective to take an extreme measure.
Irreversible Crisis
Suspicion reaches the undercover operation as several personal and professional decisions cannot be undone. The resulting crisis becomes the most dangerous stage of the investigation.
Key Events
-
Suspicion Spreads — The criminal leader begins to suspect the undercover detective, and four irreversible decisions trigger the largest crisis so far.
-
Battle Creates Fracture — A battle with a rival creates a fracture in the criminal network.
-
Trade Alliance Resumes — The undercover detective joins forces with another participant to resume the disrupted trade.
Final Deal and Arrest
A battle fractures the criminal network, but the trade resumes through a new alliance. Duty and feelings collide before an accident delays the final deal and an international arrest operation is prepared.
Key Events
-
Duty Versus Feelings — The undercover detective and the woman struggle to balance professional duty with personal feelings as surveillance continues.
-
Final Trade Crisis — An accident halts the trade, creating an immediate crisis before the final deal.
-
International Arrest Operation — The criminal leader and the undercover detective proceed toward the final deal while Korea, China, and Japan prepare for the arrest.
Set in the 1980s, a husband and wife, both detectives, infiltrate a massive criminal organization responsible for the illegal drug trade between Korea, China, and Japan.
