What magical barrier protects humans from demons in KPop Demon Hunters?

The magical barrier protecting humans from demons in KPop Demon Hunters is the Honmoon.

According to the film’s mythology, three women originally became demon hunters and used their singing voices to create the Honmoon. Later generations of hunter trios maintained the barrier, linking the supernatural defense of humanity directly to music and performance.

Huntrix is the latest trio responsible for strengthening it. Their goal is to transform the Honmoon into the Golden Honmoon, a final seal intended to banish demons permanently. The Saja Boys threaten this plan by stealing fans and weakening the barrier through their supernatural influence.

The Honmoon is not simply a physical wall. It represents the combined power of the hunters, their songs, their audience, and their emotional unity. When Huntrix reunites at the climax, the story ends with a new rainbow Honmoon.