To save Yuan, a severely injured mermaid, Lin Wanqing is branded a jinx by the entire village. Her stepmother seizes the family property, while the local bully, Wang Baocheng, plots to steal her boat and drives her into a desperate situation. Yuan repays her kindness with a secret from the deep sea, guiding her to catch a premium yellow-lip fish during a once-in-thirty-years fish migration. She makes an astonishing 500,000 overnight, using cash to humiliate her enemies right before their eyes. After becoming wealthy, she investigates the truth behind her father's disappearance and exposes the village's richest man's murder conspiracy. Yuan exhausts his divine powers to save her and returns to the deep sea, leaving them separated forever. All he leaves behind is a drop of blue amber to protect her and ensure her safety at sea for the rest of her life. Five years later, Lin Wanqing has become an owner of an ocean-going fishing fleet. Whenever she sails, a silver-blue fish silhouette silently follows her. Their bond of protection transcends species and never fades.