About the title
Joong-ho, a former police officer turned pimp, notices that his girls have been disappearing one by one. When there's no one left to send on the next call, he sends the last available call girl, who had claimed to be sick, to see a client. She leaves her five-year-old daughter at home and goes — and she disappears too. Someone must be poaching his girls, Joong-ho decides, and he starts checking the phone numbers the calls came from. It turns out that all the missing girls went to the same client — the one the last girl went to as well.