It tells the story of Jeong Ba-reum (Lee Seung-gi), a well-known upright young man and patrol officer, as well as Go Moo-chi (Lee Hee-joon), a crime police officer who lost his parents to a murderer when he was a child and now lives for revenge. After they face the most vicious “predator”, who is known as the top 1% of mental patients, their fate is completely reversed....

It tells the story of Jeong Ba-reum (Lee Seung-gi), a well-known upright young man and patrol officer, as well as Go Moo-chi (Lee Hee-joon), a crime police officer who lost his parents to a murderer when he was a child and now lives for revenge. After they face the most vicious “predator”, who is known as the top 1% of mental patients, their fate is completely reversed....

"Do you believe in fairy tales and legends? The beloved star actress Gianna Jun brings legend to real life as an attractive mermaid, Sim-Chung. As she begins her life on land away from the sea, Sim-Chung runs into Heo Jun-Jae, the intelligent and good-looking con artist played by Lee Min-Ho. Will this odd couple ever get along? As the legend goes, mermaids are able to walk on land once they reach a certain age. <Legend of the Blue Sea> is a ‘fantasy romance’ drama where an unsuspecting mermaid crashes in the living room of a savvy con artist. Surrounded by a concrete jungle outside of the ocean, Sim-Chung explores her new world with sparkling eyes, while Jun-Jae has other ideas to use Sim-Chung’s special abilities for his schemes. The two have very different agendas, but their paths slowly begin to converge as fate sprinkles romance along the road…"...