Official website: http://www.imbc.com/broad/tv/drama/mermaid
Jang Seo-hee
Eun Ariyoung
Woo Hee-jin
Eun Ye-young
Kim Sung-min
Lee Joo-wang
Jung Bo-seog
Mamajun
Park Tam-hee
Soo-rim
Kim Byeong-gi
Lee Sung-soo
Choi Sun-ja
Dong-jin's mother
Jeon Mi-seon
Seong-mi
Jung Young-sook
Han Gyeong-hye
Park Keun-hyong
Eun Jin-seob