Bad and Crazy

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.