When doubts arise about a five-year-old murder conviction, a veteran detective partners with a young hotshot to hunt down the case's hidden truths.
On their first day as partners, detectives Kang Do-chang and Oh Ji-hyeok pick up a series of calls with perplexing connections to a closed murder case.
Intrigued by emerging claims of Lee Dae-cheol's innocence, Jin Seo-kyeong asks Do-chang for a meeting; the police search for the missing girl.
Unable to ignore new CCTV footage of Dae-cheol, Do-chang and Ji-hyeok look for answers.. Seo-kyeong receives a troubling call from Park Geon-ho.
Do-chang visits Lee Eun-hye at the hospital; when Ji-hyeok sends Seo-kyeong a photograph of a suspect, she realizes she's in immediate danger.
After discovering a connection between Oh Jong-tae and the woman murdered five years ago, the detective squad begins working on the case in secret.
To secure a retrial for Dae-cheol, Do-chang comes clean about a slip-up in the original investigation; Seo-kyeong shares her suspicions with her boss.
Afraid of hurting his daughter, Dae-cheol considers walking away from the trial; Do-chang and Ji-hyeok chase down more information on Jong-tae.
Seo-kyeong gets her hands on a recording that may prove decisive for Dae-cheol's trial; Do-chang takes the stand to testify.
As Ji-hyeok continues digging for the truth, he obtains an audio file from Seo-kyeong; Jong-tae schemes to destroy Ji-hyeok's detective career.
Revisiting the scene of a supposed suicide, detectives discover neglected evidence; Eun-hye and Seo-kyeong help Do-chang clear Ji-hyeok's name.
Detectives follow Cho Seong-dae while he evades capture; Ji-hyeok stops by the newsroom, suspecting a link between Jong-tae and Yoo Jeong-seok.
A furious Do-chang confronts Jeong-seok; despite being questioned by police auditors, the squad refuse to give up on the investigation.
The squad and Nam Guk-hyeon each attempt to figure out the real culprit responsible for the death of a detective; Seo-kyeong uncovers another lead.
In the interrogation room, Jong-tae refuses to confess to his crimes; Yoon Sang-mi extends a hand to Seo-kyeong and Do-chang.
Jong-tae gets his hands on an incriminating video that guarantees him an upper hand against Jeong-seok, but Jeong-seok has got plans of his own.
Jong-tae is arrested and placed on trial; still not prepared to walk away from the case, Ji-hyeok learns there's more to the video footage.
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