K-drama fans have another exciting title to add to their watchlists. tvN has officially unveiled the cast lineup for its upcoming 2027 drama Whale Star, bringing together an impressive ensemble led by Choi Woo-shik and Moon Ga-young. Set against the backdrop of 1920s Gyeongseong during the Japanese occupation, the series promises a moving blend of romance, sacrifice, and youthful passion.

Adapted from the beloved webtoon Whale Star: The Gyeongseong Mermaid, the drama reimagines the classic tale of The Little Mermaid through the lens of Korean history. With a stellar cast that also includes Heo Nam-jun, Yoo Jae-myung, Kang Han-na, Kim Yeo-jin, and Gong Seung-yeon, expectations are already soaring for what could become one of tvN’s biggest historical dramas.

Quick Drama Facts

• Drama Title: Whale Star (고래별)
• Korean Title: Whale Star: The Gyeongseong Mermaid
• Genre: Historical, Romance, Melodrama
• Network: tvN
• Release Date: 2027
• Streaming Platform: TVING
• Directors: Heo Jin-ho and Yoo Bum-sang
• Based On: The popular webtoon by Na Yoon-hee

Plot Summary

Set in 1926 Gyeongseong, a time when speaking one’s mind could put lives at risk, Whale Star follows the lives of young people who continue to love and dream despite living under oppression.

Kang Ui-hyeon is an independence activist who dedicates himself to the fight for his country’s freedom. Meanwhile, Heo Su-a works as a maid for a wealthy family with ties to the Japanese authorities. Their lives become intertwined when Su-a rescues the wounded Ui-hyeon from the sea.

As their relationship deepens, the pair face impossible choices, personal sacrifices, and the harsh realities of a turbulent era. Their story becomes one of hope, courage, and unwavering devotion amid uncertain times.

Cast and Characters

Choi Woo-shik as Kang Ui-hyeon

Choi Woo-shik takes on the role of Kang Ui-hyeon, a passionate independence fighter determined to protect his homeland. Although he comes from a privileged family, he chooses to walk a different path and joins the resistance movement.

Moon Ga-young as Heo Su-a

Moon Ga-young plays Heo Su-a, a kind and strong-willed young woman who works as a maid in a pro-Japanese household. A chance encounter with Ui-hyeon changes the course of her life and draws her into the struggle for freedom.

Heo Nam-jun as Song Hae-su

Song Hae-su is a fellow independence activist who has endured heartbreaking losses. His unwavering dedication to the cause makes him a powerful ally and a key figure in the story.

Yoo Jae-myung as Kang Geun-hyung: Veteran actor Yoo Jae-myung portrays Kang Geun-hyung, Ui-hyeon’s father, whose ambitions and political stance put him at odds with his son.

Kang Han-na as Han Yeon-kyung: Han Yeon-kyung is a resilient woman who continues fighting despite experiencing devastating personal tragedies.

Kim Yeo-jin as Hwang Soon-im: Kim Yeo-jin stars as the owner of Café Whale Star, a place that provides comfort and shelter to members of the resistance movement.

Gong Seung-yeon as Yeo Yoon-hwa: Gong Seung-yeon plays Yeo Yoon-hwa, the daughter of the household where Su-a works. Though she appears distant, she shares a close bond with Su-a.

Why Fans Are Excited

• First-ever collaboration between Choi Woo-shik and Moon Ga-young.
• Adaptation of the award-winning webtoon Whale Star: The Gyeongseong Mermaid.
• Emotional romance set during Korea’s independence movement.
• Acclaimed directors Heo Jin-ho and Yoo Bum-sang at the helm.
• Strong supporting cast featuring some of Korea’s most talented actors.
• Beautiful mix of romance, history, and melodrama.

Where to Watch

Whale Star is scheduled to air on tvN in 2027. Streaming availability outside South Korea is expected to be announced closer to its release.

Final Thoughts

With its compelling historical setting, emotional love story, and powerhouse cast, Whale Star is shaping up to be one of the most anticipated Korean dramas of 2027. Choi Woo-shik and Moon Ga-young’s pairing alone has generated immense excitement among fans, and the addition of an outstanding supporting cast only raises expectations further.

If you’re a fan of historical romances filled with heartfelt emotions and unforgettable characters, Whale Star deserves a spot on your watchlist.