Goemool

In 2000, an American pathologist orders his Korean assistant to dump hundreds of bottles containing formaldehyde down a drain which leads to the Han River. Over the next few years, several sightings of a strange amphibious creature in the waterway around Seoul occur. Park Gang-du, a slow-witted man, runs a small snack bar in Hangang Park with his father, Hee-bong. Gang-du's other family members include his daughter, Hyun-seo; his sister Nam-joo, an Olympic archer; and his brother, Nam-il, an unemployed college graduate. When the creature emerges from the Han River, Gang-du grabs his daughter and joins the fleeing crowd, but inadvertently lets go of her hand, and she is snatched by the monster.