Jian, a bounty hunter suspected of being a weak-willed gunman, finally pulls out a gun to protect Hyeri, a wanted criminal who was loved at first sight.

A near future Korea where criminals' faces and bounty information are shared with all security officers, and so-called bounty hunters, through new technology. Security officers live on bounties (coins). Although the usage of guns is permitted, for some reason Jian is not able to shoot. Seoktae slights Jian for being too soft and considers it unfair that boss Kang covers for Jian nevertheless. Jian has no interest in big bounties and only goes after petty offenders, whereas Seoktae is eager to collect coins quickly. Jian is captivated by Hyeri, when they encounter each other while on a hunt. At this time, boss Kang and the other packs chase Hyeri, who has a huge bounty on her. At last, Jian pulls out a gun in order to protect Hyeri.

The future in SLAP BANG BANG is a world that is heading towards destruction through war, famine, riots, and extortion. In a world where people constantly doubt and are wary of each other, Jian's blind and unconditional love indicates that love is the greatest in the end, even while the world is headed towards its end. Love may be the driving force that moves Jian and at the same time has the power to move the hearts of the audience. It is not an easy task to articulate a genre film with a limited budget of an independent film. This film is a love story that wears a skin of science fiction and Western. Animating live action through the rotoscoping technique is an intelligent solution to overcome the limitations of the film.