An ex-special agent is involved in a convoluted drug ring drama. He has to save a drug smuggler's innocent daughter from being the victim of her parents' fight.
A hitman accidentally kills a little girl. Filled with regret, he wants to quit. But then to tie up loose ends, he is forced to go on another job, to kill the girl's mother.
This is the story of a 7-year-old boy, Sang-woo, born and raised in the big city, and his mute grandmother, who has spent her whole life in a small rural village.