Synopsis for
Gwoemul (2006) More at IMDbPro »

After a careless Morgue empties hundreds of bottles of formaldehyde into the sewers near Seoul's Han River, it gives birth to a terrifying mutant with a taste for blood. The Mutant abducts the daughter of Gang-du (Kang-ho Song). Thinking she is dead, the family mourns her loss; until they receive a late-night call from her cell phone. Knowing she is alive, they band together to find and rescue her from the mutant before it is too late.

Their attempts are thwarted by a paranoid Government, who is claiming that the mutant is "living biological warfare", after a Marine from the United States contracts a mysterious disease from coming in contact with the creature. Fearing another SARS incident, they seal off the area the mutant is known to patrol and quarantine anybody and everybody who has came in contact with the mutant - including Gang-du and his family - though no virus actually exists.

As the U.S Government bears down on South Korea in an attempt to contain the creature and the supposed "virus" it is carrying, Gang-du and his family break free to confront the monster head-on. However, in the midst of all of this, the American Government finally reaches the end of it's rope and carelessly unleashes "Agent Yellow", a dangerous and toxic gas the U.S. Military had been developing to help fight biological warfare. Though the U.S. Government assures it is safe to use, the people of Korea protest its use at the edge of the Han River where "Agent Yellow" will be unleashed - making them an easy target for the mutant.

Gang-du, his family, the mutant, and the government all confront one another in a dangerous battle that ends with both the monster - and Gang-Du's daughter - dead.