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A crime unit with the lowest arrest rate gets started on its first case with its new chief, Yubin.
The team investigates a murder disguised as a suicide and gets in a bind as another death occurs.
The team advances the investigation with information from the witness. Yubin identifies the suspect.
A fire breaks out at a fried chicken shop run by Joongryeok's acquaintance.
The team narrows down the arson suspects but hits a dead end. Yubin then proposes a shocking theory.
Following Yubin's lead, the team pivots their investigation and uncovers new information.
A six-year-old girl is kidnapped. Amid the kidnapper's threats, Yubin dismisses a prime suspect.
Another team takes over the case, but Yubin's team secretly continues probing, sparking a showdown.
Armed with Tansik's clue, the team sneaks into a restricted area and faces a perilous situation.
The team identifies a suspect but lacks proof. Meanwhile, time is running out for them.
A woman arrested for breaking in is a romance scam victim. The team set up a stakeout.
Yubin's team baits the suspect but finds out things are not as they seem.
The team takes on a cultural artifact theft case and investigates everyone with access to the house.
The suspect claims someone else stole the painting. The team goes undercover to catch the culprit.
Yubin's team uncovers a union of gangsters and forms the Dongbang Group to infiltrate it.
Yubin's team leads a double life and manages to meet the right-hand man of the MZ Union's boss.
A university student is found to have been murdered the same way Yubin's fiancée was.
Hyunwoo identifies the murderer. Meanwhile, Junghwan obtains CCTV evidence but falls in danger.
Joongryeok hunts down Junghwan's attacker, while Yubin discovers crucial evidence has vanished.
The team trusts Yubin's claim that the real murderer is still out there, and gathers evidence.
