Team Bulldog: Off-duty Investigation

Moo-young and Kang-ho find out a strange commonality between the case and a cold case 13 years ago.

With criminal right under his nose, Kang-ho is suspended. He begins to collaborate with Moo-young.

Butterfly serial murder resumes as Min-ki escapes. Suspicious link between him and Tak Won is found.

Kang-ho is expelled from the TF. He and Moo-young fall into a trap as Teddy and Tak's past uncovers.

The police declare the real culprit and calm public anger. But Kang-ho and Moo-young don't stop.

A boy is found dead after 10 years in a manhole. Ban-seok falls into a panic as Ka-eun disappears.

Ban-seok finds Ka-eun's bracelet on the body discovered in a mountain. He asks Kang-ho for help.

Ka-eun becomes the murder suspect of her boyfriend. And the children caught confess she killed him.

A medical student is found murdered at home. Moo-young finds its connection to another cold case.

Moo-young decides to accept the deal. Failing to arrest him, Kang-ho goes to find the only survivor.

The survivor is found inside the trash pile. And Moo-young exposes information learned from Ki-tae.

Despite Team Bulldog's hard work, the commissioner dismisses Kang-ho. The team jumps into the trap.