Infighting breaks out between factions of the Communist Party over whether to back the U.N. Trusteeship under which the Korean Peninsula is to be divided between U.S. and Soviet control. One faction hires a hit man to kill the leader of the opposing faction. The hit man is known as the best in his field, yet is also known for having a heart.

A space creature named Wangmagwi lands on Earth in a flying saucer with plans to dominate the planet. Koreans of every corner of the world battle against the colossal invader as it wreaks havoc across the land.