Former secret agent Baek Shi Yoon (Park Shi-hoo) is a well-trained human weapon. Hiding his past, he buys the bar "Neighborhood" and runs it as the owner. He gets close to the neighborhood regulars at his bar and he sympathizes with their pain. He then meets a young man, Choi Chan Gyu (Lee Soo-hyuk) who works as a temporary employee. Choi Chan Gyu wants to become a police officer. Baek Shi Yoon trains him as a secret agent and they fight together against evil.