Season 1

An unlikely partnership is forged, between a passionate cop and an emotionless prosecutor, to bring an evasive serial killer to justice.

1. 

   1. I Am Innocent

   2017-06-10 · 77m

   As a teen, prosecutor Hwang Si-mok received surgical treatment for his abnormally developed brain, but the procedure left behind serious side effects.

2. 

   2. Just Turn On The Lights

   2017-06-11 · 69m

   The convict's strong plea for his innocence prompts Si-mok to review the CCTV clip. At the Yongsan police station, he runs into officer Han Yeo-jin.

3. 

   3. A New Possible Suspect

   2017-06-17 · 76m

   Si-mok volunteers to appear on live national TV to discuss Kang Jin-seob. He also makes a bold promise to find the culprit within two months.

4. 

   4. Kwon Min Ah

   2017-06-18 · 69m

   Rumors quickly spread about Si-mok's violent nature. Regardless, he persists in his investigation. He finds his mentee, Young Eun-su, suspicious.

5. 

   5. The Second Huam-dong Case

   2017-06-24 · 63m

   Si-mok, puzzled by the details of the most recent murder case, visits the victim's home to seek more clues. Yeo-jin joins him in the investigation.

6. 

   6. The Ringtone

   2017-06-25 · 64m

   New pieces of evidence only increase the list of possible suspects. In the midst of the confusion, a few begin to question Si-mok's innocence.

7. 

   7. Ga Young's Phone

   2017-07-01 · 71m

   Si-mok and Yeo-jin team up to covertly pursue Seo Dong-jae. Just as Dong-jae is about to throw something into the Han River, Yeo-jin stops him.

8. 

   8. Western Seoul Prosecutors' Office

   2017-07-02 · 67m

   Enraged by what the police did to Park Kyung-wan, Yeo-jin tries to confront her superior but is stopped by Si-mok, who warns her of the consequences.

9. 

   9. Special Investigation

   2017-07-08 · 66m

   Si-mok selects key lawyers and police officers to be part of the special investigations team. Their probe begins with Dong-jae as the starting point.

10. 

    10. Revelation

    2017-07-09 · 67m

    Fearing for Ga-young's safety, Yeo-jin proceeds to transfer her to a different hospital. A nurse informs Yeo-jin of something strange that happened.

11. 

    11. Cold and Damp

    2017-07-15 · 68m

    The truth behind Ga-young's convulsions is revealed. Chang-jun's wife receives a travel ban. Woo-gyun asks Chang-jun to help him get out of his mess.

12. 

    12. Disbandment

    2017-07-16 · 66m

    Si-mok and Yeo-jin discover perplexing leads while searching Kyung-wan's basement. Dong-jae goes back to Chang-jun's office to fetch his cell phone.

13. 

    13. 0 and 7

    2017-07-22 · 67m

    Returning home from the rooftop party, Si-mok discovers that an intruder has left something in his bedroom. Yeo-jin and Geon come over right away.

14. 

    14. Another Body

    2017-07-23 · 66m

    Yeo-jin suspects a new killer is involved in the latest murder incident. Meanwhile, Si-mok collapses after leaving the autopsy.

15. 

    15. Accomplice

    2017-07-29 · 77m

    Yeo-jin collects evidence as Si-mok interrogates the suspect. Many questions get answered, but the most important problem of all remains to be solved.

16. 

    16. A Monster

    2017-07-30 · 86m

    Si-mok sets out to meet the one he believes is the real murderer. He gets his hands on a bag that will determine the futures of many people.