Season 1 of Deceiving Sea premiered on January 26, 2021.

A strange man with amnesia appears on an island; there, he meets Moya, begins to fall in love and starts building her an island resort. Against the warnings of her best friend, Moya starts to fall in love with him too. However, just as their love blooms, a pregnant woman arrives, claiming the man is her husband. She takes him back. So Moya tries to forget him, but he returns with memories intact as a player.