[5] South Korean air force pilot Oh Jeong-hwan and his betrothed, Ahn-hee, are excited for their wedding, which is to occur the next day.

Oh Jeong-hwan is called to the air force base because of an unspecified emergency, which they presume to be related to the incoming typhoon.

Although the monster is initially human-sized, it grows enormous because Earth's gravity is much lower than that of the Gamma star.

The next day, Seoul is being evacuated because of the monster's approach, but Ahn-hee and her mother linger, determined to follow through with the planned wedding.

During the rampage, the monster attempts to crush a homeless boy named Squirrel, who was earlier looting Ahn-Hee's home.

Although Space Monster Wangmagwi has an overarching plot, much of the film is instead composed of comedy sketches that have little-to-no impact on the story.

Although Space Monster Wangmagwi concerns an attack by alien lifeforms instead of any real-world aggressor, Sueng-hoon Jeong and John Goodrich point out that the film contains many allusions to the Korean War.

Sueng-hoon Jeong points out that Ahn-hee, with her western-style clothing and modern attitude, is "a symbol of a new, emergent nuclear family."

This modern perspective on family values is especially apparent in Ahn-hee and Oh Jeong-hwan's decision to adopt Squirrel, when blood-relation was traditionally very important in Korean culture.