After giving birth to a baby boy in February 2016, Jeon Ji Hyun (My Love from the Star) returns to the small screen in the SBS mega-hit The Legend of the Blue Sea. My Love from the Star screenwriter Park Ji Eun and Master's Sun director Jin Hyuk reinterpret the ancient mermaid tale from Joseon scholar Yoo Mong In's classic Eou Yadam into a modern love story between a swindler and a mermaid. The fantasy romance co-stars Lee Min Ho (The Heirs), who won Top Excellence Award at the 2016 SBS Drama Awards.
Heo Joon Jae (Lee Min Ho) is a charming con artist who swindles money by posing as different professionals. While taking a vacation in Spain, he meets Shim Cheong (Jeon Ji Hyun), the only mermaid left in the world. Though he steals her valuable bangle, Shim Cheong still believes in him. Hence, Joon Jae decides to take care of her and returns the bangle, which forms a connection between the two and their previous incarnations.