Grizzled veteran detective who takes up the case of the missing family and teams up with profiler Yoon Seo-young to uncover what really happened during the trip.
A tense cat-and-mouse dynamic where the detective pursues the truth while the suspect orchestrates misdirection.
Dong-kook is dispatched to investigate Woo-hyun's claims; Woo-hyun withholds information and actively manipulates the investigation to serve his own a...
Yoon Seo-young and Ko Dong-kook complement each other's investigative blind spots, driving the plot forward.
In episode 5, Although the case is not closed, Dong-guk celebrates what happened. Meanwhile, Seo-young finds something that was in her blind spot due...
Two investigators overcome initial friction to form a tightly coordinated team.
Seo-young initially refuses Dong-kook's help but they later collaborate to gather evidence at Woo-hyun's house despite institutional pushback.
Kang Woo-hyun turns the tables by kidnapping and torturing Ko Dong-kook to demonstrate his commitment to the criminal group.
In episode 7, Dong Guk is abducted and tortured in an unknown location, while Woo Hyun passes the test and reveals his true motives.
Ko Dong-kook's relentless investigation poses a direct threat to Hong Won Tae's criminal empire and personal safety.
In episode 7, Dong Guk’s acquaintances dig deeper into Woo Hyun's case, directly threatening Hong Won Tae's operations.
A professional bond that transforms into a personal vendetta following a colleague's suspicious death.
Detective Bae falls from the hospital and dies; Dong-kook believes he was murdered, which solidifies his resolve to pursue the case aggressively.
A stable familial anchor that contrasts with Dong-kook's increasingly dangerous professional life.
Go Min Joo is Dong-kook's daughter; Dong-kook's personal advice to Woo-hyun about losing a child reflects his paternal experience and emotional stakes...
A supporting investigative link that reinforces the police effort against internal and external pushback.
Detective Gwang Su Dae is mentioned as digging deeper into Woo-hyun's case alongside Dong-kook's acquaintances despite institutional resistance.
Explore the full interactive character relationship map of Trap