Seafood business owner Luo Dahai is betrayed by his apprentice and fiancée, framed by his arch-enemy into bearing eight million in huge debts. After losing the fishing boat left behind by his father in despair, he jumps into the sea, only to be saved by Ao Mili, the East Sea dragon girl who sneaked down to the mortal realm. Luo Dahai adopts Mili as his daughter, and the human and dragon depend on each other for survival. Relying on his superb fishing skills, coupled with Mili's divine dragon powers, Luo Dahai fights back against the villains' endless underhanded tricks, stages a dramatic comeback in the Fish King competition, and gathers evidence to expose all conspiracies. After testing separations and bringing the wicked to justice, Luo Dahai pays off his debts, reclaims his fishing boat, harvests love, and finally reunites with his dragon daughter who returns to the mortal world. The story blends the satisfying thrill of coastal fishing, paternal warmth, and business rivalry.