mutant

American military pathologist commanding a reluctant Korean assistant to violate protocol by dumping over 100 bottles of formaldehyde down the drain, which leads to the Han River. A few years later, two men are standing and fishing in Han River when one discovers a mutant amphibian (which is never shown). He releases the palm-sized creature when it bites him. Four more years later, a man commits suicide by jumping off a bridge into Han River, but not before noticing that there's "something dark, underwater."

Thousands of candles can be lit from a single candle, and the life of the candle will not be shortened. Happiness never decreases by being shared. - Buddha