The Idle Mermaid

Jo Bo-ah

Kim Ha-ni

Jo Bo-ah

Aileen

Joo-Wan On

Lee Hyun-myung

Song Jae-rim

Kwon Shi-Kyung

Ji-Soo Park

Yoon Jin-A

Nam Joo-hyuk

Big

Kim Jae-hwa

Kim Woo-seon

Ahn Kil-kang

An Ma-nyeo

Kim Seul-gi

Ahn Hye-yeong

Hee-kyung Jin

Hong Myeong-hee

Kim Min-kyo

Do Ji-Yong

Jin-hee Kim

Han Gook-ja

Kim Ha Rin

Park Geum Bi

Lincoln Lambert

Child

Chan-woo Jung

Aileen's brother