Young fisherman Qin Shuhuan encounters family misfortune, carrying heavy debts and loved ones in distress. Holding fast to his original intent, he relies on the fishing master system to tread the waves and cultivate the sea, reaping marine treasures through labor and resolving family crises. Entrusted by the ship king, he sets out with partners across the four seas to explore rare sea fish. During the voyage, he fights bravely against illegal forces, guards maritime peace, harbors a love for the azure motherland, adheres to the maritime national sentiment, overcomes all hardships to complete his mission, and continues heading to the sea to guard the blue territory.