Season 1

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  7.9/10208 votes

  Episode 1

  Season 1 Episode 1 - Aired 12/17/2021

  After getting an officer suspended from service, Ryu Su-yeol gets a step closer to a promotion. Oh Gyeong-tae looks for a young girl's missing mom.

  Director: Unknown

  Writer: Unknown

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  8.5/10173 votes

  Episode 2

  Season 1 Episode 2 - Aired 12/18/2021

  Su-yeol retraces Gyeong-tae's steps while tracking down the man in the helmet. Lee Hui-gyeom goes after a necklace that may hold crucial evidence.

  Director: Unknown

  Writer: Unknown

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  8.3/10141 votes

  Episode 3

  Season 1 Episode 3 - Aired 12/24/2021

  Su-yeol falls from Do Yu-gon's good graces. While searching for the necklace at home, Su-yeol finds a collection of objects that are not his.

  Director: Unknown

  Writer: Unknown

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  8.1/10136 votes

  Episode 4

  Season 1 Episode 4 - Aired 12/25/2021

  After ensuring Gyeong-tae's safety, Su-yeol pulls a dirty move. With Kim Gye-sik back on the force, the narcotics unit tracks down a street drug.

  Director: Unknown

  Writer: Unknown

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  8.0/10123 votes

  Episode 5

  Season 1 Episode 5 - Aired 12/31/2021

  Su-yeol searches high and low to prove Hui-gyeom's innocence. But the deeper he dives into the case, the closer he comes to falling into a trap.

  Director: Unknown

  Writer: Unknown

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  8.0/10124 votes

  Episode 6

  Season 1 Episode 6 - Aired 1/1/2022

  Su-yeol reopens a closed case. He teams up with K to investigate quietly and uncovers the opponent's weakness. Meanwhile, the body count grows.

  Director: Unknown

  Writer: Unknown

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  8.5/10125 votes

  Episode 7

  Season 1 Episode 7 - Aired 1/7/2022

  Su-yeol and Hui-gyeom shift focus to the head of the drug cartel. Ms. Yong threatens the police to get the seized assets back in her hands.

  Director: Unknown

  Writer: Unknown

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  8.3/10126 votes

  Episode 8

  Season 1 Episode 8 - Aired 1/8/2022

  Su-yeol learns that K is closely linked to his childhood trauma. A girl shows up at the police station, delirious and covered in someone else's blood.

  Director: Unknown

  Writer: Unknown

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  8.3/10118 votes

  Episode 9

  Season 1 Episode 9 - Aired 1/14/2022

  When bits of his memory return, Su-yeol reexamines the murder of his father. Finding similar cases, he learns one person was involved in all of them.

  Director: Unknown

  Writer: Unknown

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  8.4/10113 votes

  Episode 10

  Season 1 Episode 10 - Aired 1/21/2022

  As the identity of X comes to light, his deranged schemes pick up pace. He comes between Su-yeol and K by revealing K's murderous instincts.

  Director: Unknown

  Writer: Unknown

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  8.5/10132 votes

  Episode 11

  Season 1 Episode 11 - Aired 1/22/2022

  Su-yeol visits Shin Ju-hyeok to seek treatment, but unleashes a very angry K instead. A victim opens up after an attempted suicide.

  Director: Unknown

  Writer: Unknown

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  8.2/10123 votes

  Episode 12

  Season 1 Episode 12 - Aired 1/28/2022

  Su-yeol's hunt for the truth endangers those around him. He has a final face-off with the crazed killer at the place where it all began.

  Director: Unknown

  Writer: Unknown