When one of his girls disappears, Joong-ho assumes the usual explanations—ran off with a client, defaulted on a debt—until a pattern of vanished women and an empty voicemail reveal a far more sinister possibility. The film pivots here from gritty survival drama to psychological thriller. The antagonist is not introduced with cinematic flourish; instead he arrives as a function of absence: a sequence of calls on discarded phones, cars appearing in the background, and a malevolent intelligence that never has to explain itself. This approach renders the killer more elemental—an invisible predator whose power derives from anonymity and meticulous control.