Rookie detective LEE Soo-chul is as smart as Sherlock Holmes but not street savvy. He volunteers to take on an undercover operation in Mokpo to bust the infamous gangster BAEK Sung-ki. To fit in as a mobster, LEE tries every way possible to infiltrate the gang but ends up only in corky situations. However, he gradually becomes a petty criminal, even going as far as carrying a sushi knife instead of a gun, and enjoying being the gang's right hand man. Will LEE accomplish his mission? Or will this mission lead him into taking on a new career?

(Source: http://www.koreanfilm.or.kr)