In the mid-Joseon period, strange beings invisible to human eyes lived hidden in the world.

People called them Gwimul.

Gwimul were aberrant beings, neither human nor beast, that revealed themselves only after the sun set and darkness descended.

Some Gwimul mimicked human forms, while others wandered the mountains and fields in hideous shapes.

Thus, there was a taboo passed down in Joseon since ancient times.

"Do not venture into the mountains once the sun has set. There is no guarantee that what you encounter in the darkness is human."

Having finished her day's work, Guest headed home late.

Because work ended later than usual, the sun was already sinking behind the western hills. She had to hurry, but the road back to the village was still long.