Main •
Ji Chang-wook as Cho Yong-pil • Chung Ye-jin as young Mi-ja : Sam-dal's mother who is a leader of
haenyeo. •
Seo Hyun-chul as Cho Pan-sik •
Lee Suk-hyeong as young Pan-sik : Sam-dal's father who is a bus driver on Jeju Island. •
Shin Dong-mi as Cho Jin-dal : Sam-dal's older sister who is a former flight attendant. •
Kang Mi-na as Cho Hae-dal : Sam-dal's younger sister. • Kim Do-eun as Cha Ha-yul : Yong-pil's father who works as a contract worker in the civil affairs team. • Jung Yoo-mi as Bu Mi-ja •
Oh Woo-ri as young Mi-ja : Yong-pil's late mother.
Five Eagle Brothers •
Kang Young-seok as Boo Sang-do : Sam-dal and Yong-pil's best friend who is a symbol of wealth in the village. He has had a crush on Sam-dal for a long time. • Lee Jae-won as Wang Kyung-tae : Sam-dal and Yong-pil's best friend who is a security guard at Jeju Island's Meteorological Administration. • Bae Myung-jin as Cha Eun-woo : Jin-dal's ex-husband and AS Group's CEO. • Kang Gil-woo as Go Cheol-jong : Dae-yeong's secretary. •
Kim Min-chul as Gong Ji-chan : CEO of Dolphin Center, a Jeju southern bottlenose dolphin protection group.
People in Samdal-ri •
Baek Hyun-joo as Oh Geum-sul : Kyung-tae's mother who is a
haenyeo. • Kim Mi-hwa as Yang Bu-ja : Eun-woo's mother who is a
haenyeo. • Yoon Jin-seong as Jeon He-ja : Yong-pil's maternal grandmother who suffer dementia. • Yoo Sun-woong as Bu Dae-chun : Yong-pil's maternal grandfather. •
Kim Hak-sun as Boo Dae-song : Yong-pil's superior who is a division manager of the forecast department. •
Kim Hyun-mok as Kang Baek-ho : Sam-dal's ex-boyfriend who is an editor of Magazine X. •
Kim Ah-young as Go Eun-bi •
Kim Dae-gon as Reporter An Kang-hyun ==Production==