

"It takes a bad guy to catch a bad guy."
Hong Gil-dong is an infallible private detective with an exceptional memory and quirky personality. While chasing the only target he failed to find, he gets entangled in a much bigger conspiracy than he bargained for.
Hong Gil-dong

Gang Seong-il

Kim Byeong-deok

Dong-yi

President Hwang

Student

dock unidentified assailant 1

Mal-soon

Innkeeper

Policeman

Real Estate Agency Owner

Tae-jung

Used Book Store Woman

Gwi-han

Young Hong Gil-dong

Newcomer

Choi Tae-jeong
