| Duration: | 4080 min |
|---|
Outsiders of different areas gather to investigate unsolved cases that have been isolated by the polices.
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.
