Gang-du (SONG Kang-ho) works at a food-stand on the banks of the Han River. Dozing on the job, he is awakened by his daughter, Hyun-seo ( KO A-sung), who is angry with him for missing a teacher-parent meeting at school. As Gang-du walks out to the riverbank with a delivery, he notices that a large crowd of people have gathered, taking pictures and talking about something hanging from the Han River Bridge. The otherwise idyllic landscape turns suddenly to bedlam, when a terrifying creature climbs up onto the riverbank and begins to crush and eat people.
