A female assassin leaves a trail of bodies behind her as she seeks revenge.

After searching for his abducted son for three years, a devastated father attempts to track down his missing child through lucid dreams.

When his abducted brother returns seemingly a different man with no memory of the past 19 days, Jin-seok chases after the truth behind the kidnapping.

Dr. Seung-hoon sedates his landlord before medical check-up, when the old man begins telling him a convincing murder confession. Sometime later, a young woman's severed head is discovered at a butcher shop run by his landlord's son, and Seung-hoon begins to suspect that the landlord and his son are the serial killers.