Full cast of The Legend of the Blue Sea

Gianna Jun

Shim Cheong / Se-hwa

20 episodes

Lee Min-ho

Heo Joon-jae / Kim Dam-ryung

20 episodes

Lee Hee-jun

Jo Nam-doo / Park Moo

20 episodes

Shin Won-ho

Tae-oh

20 episodes

Shin Rin-a

Seo Yoo-na

20 episodes

Shin Hae-sun

Cha Shi-ah

20 episodes

Moon So-ri

Ahn Jin-joo

20 episodes

Na Young-hee

Mo Yoo-ran

20 episodes

Hwang Shin-hye

Kang Seo-hee/Kang Ji-yeon

20 episodes

Oh Yeon-ah

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

20 episodes

Lee Ji-hoon

Heo Chi-hyun

20 episodes

Park Hae-soo

Hong Dong-pyo

20 episodes

Sung Dong-il

Ma Dae-young / Yang Seung-gil

20 episodes

Choi Jung-woo

Heo Il-joong

20 episodes

Jinyoung

Young Heo Joon-jae/Kim Dam-ryeong

20 episodes

Hong Jin-kyung

Shim Cheong's Homeless Friend

20 episodes

Park Ji-il

Manager Nam

20 episodes

Lee Jae-won

Cha Dong-shik

20 episodes

Shim Yi Young

Young Moo Yoo-ran

20 episodes

Shin Eun-soo

Young Se-hwa

20 episodes

Kim Sung-ryung

Jang Jin-ok

20 episodes

Cho Jung-seok

Yoo Jong-hoon

20 episodes

Choi Kwon

Young Manager Nam

20 episodes

Kal So-won

Child Se-hwa

20 episodes

Jeon Jin-seo

Child Heo Joon-jae/Kim Dam-ryeong

20 episodes

Lee Ho-jae

Professor Jin Kyung-won/Fortune Teller

20 episodes

Seo Dong-won

Aquarium Manager

20 episodes

Krystal Jung

Flight Attendant

20 episodes

Kim Hye-yoon

Jang Jin-ok's Daughter

20 episodes

Sung Chang-hoon

Mr. Yang's Subordinate

20 episodes

Ko Kyu-pil

Bodyguard

20 episodes

Ahn Jae-hong

Missionary Thomas

20 episodes

Park Jin-joo

Nurse

20 episodes

Jeong Yu-mi

Kim Hee-jin

20 episodes

Kim Seul-gi

Mermaid

20 episodes

Carson Allen

Mermaid

20 episodes