As it has for ages past, the Han River continues to pierce the very center of the capital city Seoul. But one day in the year 2000... Through an "unfortunate incident," a creature of obscure nature is conceived in the waters of the river. As the creature slowly starts to grow in the depths of the river, people fail to sense signs of an impending disaster to their individual lives. Then one day in 2005, in front of countless citizens taking a stroll and enjoying the weekend on the banks of the Han River, the creature reveals itself in a shocking display of horror.