Prodigal Gu Changchuan is reborn and returns, awakening the Vast Sea Spirit-Dotting Seal, able to empower sea beasts. In his past life, he was addicted to gambling and ruined his family, failing his widowed sister-in-law Shen Yulan and niece Xiaobei, and resulting in his family being destroyed and dying. After rebirth, he reforms himself, protects his family, fights greedy relatives, opposes bully Du Wanjiang, teams up with saltwater crocodiles, dolphins, killer whales and other sea beasts to go to sea to hunt for treasures, saves enough for Xiaobei's surgery fee, sets up a fleet to settle down and start a career, step by step unlocking the deep sea shipwreck secret realm, opening a brand-new life.