The scene is set sometime in the near future, after some type of apocalypse or war, and Thailand has been taken over by the United States. Just released from prison, aging assassin Bae Buffgun is offered a job killing Bangkok's police chief. Buffgun forms a team of killers, comprising his old partner, Ghost Rifle and two newcomers, Dog Badbomb, a short-tempered explosives expert and Elvis M-16, who's suffered some of trauma that makes him think he's Elvis Presley. Meanwhile, Thailand's most deadly assassin, Kit Silencer has also been hired to kill the top cop. Confusion ensues, and even though the chief is killed, the crime lord who hired the killers wants them all dead anyway. All the hitmen have issues: Buffgun is guilt-ridden over abandoning his daughter years earlier. Ghost Rifle is haunted by the accidental shooting of his beautiful wife. Dog harbours a secret reason for his allegiance to Elvis. Elvis really believes he is Elvis Presley (and not an Elvis impersonator), and because the real Elvis didn't speak Thai, Elvis M-16 is incapable of understanding the language and can only respond to English commands. But none of the other hitmen speak English. Kit Silencer is driven by avenging the deaths of his parents, who were killed by a man with a trident tattoo on the inside of his right wrist. He checks everyone he kills or comes into contact with for that tattoo. Buffgun happens to be wearing a bandage over the exact spot on his wrist where a tattoo might be, so Kit suspects the older gunman.