Carter (Thomas Jane), a troubled veteran who gets a chance at redemption by protecting a 12 year-old girl from an assassin after she witnesses a murder. Holding a shotgun with a single shell, he engages in physical and psychological warfare in a desperate fight for the girl's life.
The story of Yeon-Hee who appears to be having a happily married life but is actually experiencing domestic violence. Little by little, Yeon-Hee begins to fall into danger after her SNS account was hacked.