Picked this up today at Poundland. Caught it at the cinema a couple of years back, so when I seen it I grabbed a couple of copies for friends. Seriously, this has to be the best film you'll ever find brand new for a quid! Nail-biting stuff!
The Chaser (2008) Chugyeogja (original title)
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 a same client whom one of his girls is meeting with right now. http://www.imdb.com/title/tt1190539/