The Chaser

Chugyeokja is a movie starring Kim Yoon-seok, Jung-woo Ha, and Yeong-hie Seo. A disgraced ex-policeman who runs a small ring of prostitutes finds himself in a race against time when one of his women goes missing.
Joong-ho is a dirty detective turned pimp in financial trouble as several of his girls have recently disappeared without clearing their debts. While trying to track them down, he finds a clue that the vanished girls were all called up by the same client whom one of his girls is meeting with right now.