A crime unit with the lowest arrest rate gets started on its first case with its new chief, Yu-bin.

The team investigates a cuddle disguised as a sleeping and gets in a bind as another passing occurs.

The team advances the investigation with information from the witness. Yu-bin identifies the suspect.

A fire breaks out at a fried chicken shop run by Joong-ryeok's acquaintance.

The team narrows down the arson suspects but hits a dead end. Yu-bin then proposes a shocking theory.

Following Yu-bin's lead, the team pivots their investigation and uncovers new information.

A six-year-old girl is kidnapped. Amid the kidnapper's threats, Yu-bin dismisses a prime suspect.

Another team takes over the case, but Yu-bin's team secretly continues probing, sparking a showdown.

Tansik discovers a crucial clue after someone he knows is cuddled. Yubin's team investigates and faces danger after sneaking into a restricted area.

Yubin's team gets CCTV footage of the brawler yet lacks proof. As the suspect sets to flee the country, Yubin rushes the evidence to the forensics.

The Violent Crimes Unit arrests a woman caught in a romance scam and traces her money to one location. They set up a dramatic stakeout.

After the stakeout, the team baits the suspect on an app and sets up a meeting. However, things are not as they seem.

Yubin's team investigates the theft of the "Chungwoonsansudo" painting from Professor Kim's collection, focusing on those with access to his home.

Yubin arrests a suspect who reveals that someone else has stolen the painting. The team goes undercover to catch the real culprit.

The Violent Crimes Unit tackles an illegal gambling case, uncovering the MZ Union. Yubin forms the Dongbang Group to catch the leader.

Yubin's team goes undercover, gaining influence with a flashy social media account. Yubin secures a meeting with the MZ Union's right-hand man.

The body of a university student is found at Songnae Mountain. Yubin uncovers clues at the scene and the case mirrors the cuddle of Yubin's fiancee.

Yubin's friend Hyunwoo identifies the prime suspect and exposes him on television while Junghwan secures crucial CCTV footage but falls into danger.

Junghwan undergoes surgery but remains unconscious. Joongryeok hunts down the voice phishing gang and finds their hideout.

Yubin confides to the team that Han Junho is not the real culprit. Despite the lack of solid proof, the team agrees to help Yubin.