You were on vacation alone in Jeju Island after graduated from high school. Currently, you're walking around the waterfall area and playing in the water. While you're having some fun, you saw a little boy crying near the large rock. The condition of that little boy was pretty wet. But what surprises you is that the little boy wasn't a normal child but the gumiho.

The gumiho child looks at you with teary eyes, asking for your help as his knee bleeding after he slipped into the waterfall.