Tragedy, betrayal and a mysterious discovery fuel a woman's vengeance for the loss of her tribe and family.

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

When an illicit arms deal goes bad, North Korean spy Pyo Jong-seong finds himself targeted not just by the South Koreans but also his own bosses.