Inspired by a classic Joseon legend from Korea's first collection of unofficial historical tales, about a fisherman who capture and kidnapped a mermaid, this drama tells the love story between the son of a Joseon noble family named Kim Dam-ryeong (Lee Min-ho) and a mermaid he named Se-hwa (Jun Ji-hyun).When Dam-ryeong was a kid, he almost drowned but was saved by a mermaid. Following the incident, they became friends and Dam-ryeong named her Se-hwa, after his younger sister. They ended up falling in love, but one day Dam-ryeong was forced by his family to marry another girl. Devastated by the news, Se-hwa decides to leave Dam-ryeong forever and erased all his memories of her and their love. However, fate brings them back together and they tried to escape from humans who were going to separate them. Fearing that the same ill-fate that afflicts himself and Se-hwa will replay itself, Dam-ryeong sends an artifact to be discovered in the future to try and warn his future self. The fates of Dam-ryeong and Se-hwa become entwined with their modern day incarnations. Dam-ryeong was reborn as Heo Joon-jae, a charming con-artist. He meets a mermaid who looks like Se-hwa (whom he later named Shim Chung) in Spain, and she was quickly besotted by him. Linked by dreams and mysterious artefacts, Joon-jae learns of Dam-ryeong's world and his own fate. 呆萌人鱼VS深情禁欲外星人。如果你有智商，建议还是不要看了……。俊宰的爱情—沧海月明（随剧更新）。要剧情没剧情要演技没演技。全智贤还是星星里醉酒后的甩长腿，李敏镐还是花样里的厚嘴唇，完全没能跳出之前扮演的人设里，再怎么看都是不断的重复角色，至于故事，也只是主角换了姓名继续消耗光环。。嘻嘻，“李敏镐”被评为史上最强自恋者？。全智贤+李敏镐+朴智恩=舔屏级好看韩剧，吗？。看完之后可以立刻丢弃的一部剧。百年前的握手百年后的羁绊。关于蓝色大海的前世今生。 该剧取材于韩国最早民间故事集《於于野谭》中歙谷县令金聃龄（李敏镐饰）将被渔民捕获的人鱼放归大海的人鱼传说。讲述数百年之后濒临灭绝来到都市里的人鱼沈清（全智贤饰）适应陆地生活和天才骗子许俊宰（李敏镐饰）重逢并陷入爱情的故事
