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

Ryu Soo Yeol digs deeper into the case, while Oh Kyeong Tae is wrongly framed for the murder. Amidst the dilemma between justice and success, following some valuable information received from officer Lee Hui Gyeom, Ryu Soo Yeol once again faces the crazy stranger.

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

After ensuring Kyung-tae's safety, Soo-Yeol pulls a dirty move. With Kim Kye-shik back on the force, the narcotics unit tracks down a street drug.

Soo-Yeol searches high and low to prove Hee-Gyeom's innocence. But the deeper he dives into the case, the closer he comes to falling into a trap.

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

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

Soo-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.

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

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

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

Soo-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.