A string of beheadings called the Head Hunter murders continues at a camping ground.

The Head Hunter is arrested as Mu-chi aims to kill the Head Hunter for revenge.

Chi-gook found stabbed, his watch at vineyard murder scene.

The Predator kidnaps their next prey, and Mu-chi gets a spine-chilling call.

Everyone struggles to find the reason behind the Predator's murders as sightings pour in.

Mu-chi collapses after seeing Mu-won in a terrifying state, and Han-kook is at death's door.

Bong-yi's anxiety worsens when Deok-su is released, and Ba-reum wakes up after surgery.

The investigators find a clue in the knot murder case, and Ba-reum puts his instincts to work.

Ba-reum hears a shocking story and is tormented by memories that lead to a powerful urge to kill.

Taken over by Yo-han, Ba-reum trembles in fear as he searches desperately for the culprit.

Yo-han continues to whisper in Ba-reum's head as Ba-reum snaps and does something unforgivable.

Ba-reum ignores Daniel's advice and basks in the thrill of murder, but evidence is found.

Mu-chi is shocked by the results of the culprit's DNA, and Bong-yi discovers a shocking truth.

Ba-reum clashes with Mu-chi, and Bong-yi learns who the true culprit behind the murder is.

Ba-reum's memories flood back, revealing something shocking. Mu-chi gets a call from Dong-gu.

Mu-chi suspects Ba-reum due to suspicious behavior as shocking truths emerge.

Finally remembering the entire story of the murder, Ba-reum sets traps to catch OZ.

Yo-han's last words and the final pieces of the puzzle Ba-reum put together are revealed.

Mu-chi and Bong-yi get closer to the truth as Ba-reum goes to find the last piece of the OZ puzzle.

The police set out to arrest Choi Young-shin, but a lack of evidence leads to a release.