인어공주

Jeon Do-yeon

Na-young / Young Yeon-soon

Park Hae-il

Jin-kook

고두심

Yeon-soon

김봉근

Father

Lee Sun-kyun

Do-hyeon

Park Myung-shin

Bathhouse Owner

Shin Dong-hwan

New Postman

김추월

BBQ Restaurant Owner

Yoon Ga-hyun

Diver 2

Lee Sung-min

Fruit Store Owner

이한위

Jo Young-ho

Min Bok-gi

Father's colleague