The Legend of the Blue Sea

Gianna Jun

Shim Cheong / Se-hwa

Lee Min-ho

Heo Joon-jae / Kim Dam-ryung

Lee Hee-jun

Jo Nam-doo / Park Moo

Shin Won-ho

Tae-oh

Shin Rin-a

Seo Yoo-na

Shin Hae-sun

Cha Shi-ah

Moon So-ri

Ahn Jin-joo

Na Young-hee

Mo Yoo-ran

Hwang Shin-hye

Kang Seo-hee/Kang Ji-yeon

Oh Yeon-ah

Young Kang Seo-hee/Kang Ji-yeon/Hong Nan

Lee Ji-hoon

Heo Chi-hyun

Park Hae-soo

Hong Dong-pyo

Sung Dong-il

Ma Dae-young / Yang Seung-gil

Choi Jung-woo

Heo Il-joong

Jinyoung

Young Heo Joon-jae/Kim Dam-ryeong

Hong Jin-kyung

Shim Cheong's Homeless Friend

Park Ji-il

Manager Nam

Lee Jae-won

Cha Dong-shik

Shim Yi-young

Young Moo Yoo-ran

Shin Eun-soo

Young Se-hwa

Kim Sung-ryung

Jang Jin-ok

Cho Jung-seok

Yoo Jong-hoon

Choi Kwon

Young Manager Nam

Kal So-won

Child Se-hwa

Jeon Jin-seo

Child Heo Joon-jae/Kim Dam-ryeong

Lee Ho-jae

Professor Jin Kyung-won/Fortune Teller

Seo Dong-won

Aquarium Manager

Krystal Jung

Flight Attendant

Kim Hye-yoon

Jang Jin-ok's Daughter

Sung Chang-hoon

Mr. Yang's Subordinate

Ko Kyu-pil

Bodyguard

Ahn Jae-hong

Missionary Thomas

Park Jin-joo

Nurse

Jeong Yu-mi

Kim Hee-jin

Kim Seul-gi

Mermaid

Carson Allen

Mermaid