Jo-Gap-Yeo-Ok (Jade-like nails)  / 조갑여옥 (爪甲如玉) by Shiny Tiger

Known by stunning beauty that attracts people at the first sight. Having nails as long as fingers, it takes the figure of crane when disappearing. It gives red and white balls to one that it likes. Often seen around Baengnokdam (crater lake) at Halla-san mountaintop. Meeting this creature is known to increase your luck in romance.

너무나 아름다워 한번 보면 사랑에 빠진다. 사라질때 마치 학과 같은 모습으로 사라진다. 손톱의 길이가 손가락의 길이만한데, 좋아하는 사람에게 붉은 구슬과 흰 구슬을 준다. 한라산 백록담 근처에서 가끔 출몰한다. 조갑여옥을 만나면 애정운이 높이 상승한다.

Inspired from "Encyclopedia of Korea's Monsters" by Kwak Jaesik