The Legend of the Blue Sea

Inspired by a Joseon-era historical tale from Yu Mong-in’s classic anthology Eou yadam, The Legend of the Blue Sea is a 20-episode fantasy romantic comedy drama that unfolds across two interconnected timelines. In late 16th-century Korea, Kim Dam-ryeong, a noble town magistrate, rescues and releases a captured mermaid named Se-hwa, blossoming into a deep, tragic romance thwarted by human greed and political malice.

Centuries later in modern-day Seoul and Spain, Heo Joon-jae is a brilliant, charming con artist who uses hypnosis and disguises to fleece corrupt elites. He encounters Shim Cheong, a naive yet physically powerful mermaid who has walked onto land to reunite with him. Initially targeting her valuable $6 million antique jade bracelet, Joon-jae takes her into his home, unaware of their ancient connection.

As Joon-jae begins experiencing vivid, recurring dreams sent as warnings from his past self, he unlocks the mystery of Dam-ryeong’s life. Together, Joon-jae and Shim Cheong must navigate modern corporate conspiracies, a ruthless stepmother, a murderous fugitive, and the biological countdown on a mermaid’s land-bound heart, striving to break the cycle of tragedy and rewrite their destiny.

The core thesis of The Legend of the Blue Sea is that true love possesses a spiritual imprinting that transcends time, physical form, and the erasure of conscious memory. The creators emphasize that fate is not an unchangeable prison; rather, human free will, selfless devotion, and learning from past mistakes allow individuals to break tragic karmic cycles.

While physical memories can be wiped away by supernatural means, emotional memory stored within the heart endures. The show critiques human greed, deceit, and materialism—contrasting the pure, uncalculating innocence of nature with the complex, often corrupt structures of human society. Ultimately, the series asserts that love requires vulnerability, trust, and the willingness to sacrifice oneself for another's happiness.

The series offers multiple interpretive angles:

Released during the peak of the Hallyu boom in late 2016, The Legend of the Blue Sea commanded strong domestic ratings, peaking over 21% nationwide. The series modernized traditional Korean folklore, demonstrating how ancient local legends could be adapted into contemporary urban fantasy. It had a substantial impact on East Asian fashion; Shim Cheong's oversized designer sweaters, green sequin dresses, and high-end outerwear caused several fashion items to sell out across Asia, while cementing Jun Ji-hyun and Lee Min-ho as premier international Hallyu icons.

Viewers and critics widely celebrated the explosive screen chemistry and comedic banter between Jun Ji-hyun and Lee Min-ho. Jun Ji-hyun's slapstick physical comedy and emotional range were singled out, as were the stunning high-budget visual effects and ocean cinematography. Some reviewers noted pacing drag in the middle episodes (Episodes 11–14) where family drama and corporate crime took precedence over the fantasy premise, while others drew comparisons to My Love from the Star. Overall, it is considered a classic, highly entertaining Hallyu fantasy rom-com staple.