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Traffic police Young-goon fires a gun while chasing a red light runner and is investigated by WAIS.

Byung-gil says that he was forced to kidnap and makes a deal with Young-goon, Chi-kwang and Tae-joo.

Tae-joo realizes Hyo-jung's kidney transplant is related to the organ sale case and takes in charge.

Young-goon is injured from prosecutor Lee's plan to catch Mr. Kim. The team continues investigating.

Jae-myung opens his hand to reveal a secret to Young-goon, who finally came out to meet him.

Oh Sang-do is in critical condition. Si-young sneaks in to the ICU to get rid of him for good.

Dead bodies are found in a hole at the park. Young-goon suspects Chi-kwang, who told him to dig it.

Jae-myung returns home on parole. Chi-kwang thinks he's related to Hyun-gu's death and follows him.

Young-goon loses his father and suspects Chi-kwang. He is waken up early in the morning with a call.

Young-goon finds Song-yi's blood soaked ring. Tae-joo pressures the District Attorney with evidence.

Young-goon finds the ledger that Jae-myung hid. While Chi-kwang heads to him, he opens the ledger.

Young-goon is devastated to learn that Turtle's blood is erased, but soon finds an unexpected clue.

Tae-joo quits the team after catching Turtle. Young-goon opens a cold murder case from 15 years ago.

Chi-kwang drugs Park Jin-woo and demands him to confess who the murderer from 15 years ago is.

Young-goon recalls the murderer and goes to Hae-ryong. Tae-joo and Chi-kwang try to stop him.

Young-goon is shocked to learn that his father made the Elite Club and must make a big decision.