Unable to endure the long-standing oppression of his eldest uncle's family, Lin Yu reluctantly asks to split from the household, receiving nothing but a leaky old boat and a fishing shed on the verge of collapse. Unexpectedly, he awakens the "Blue Fisher" system and begins his rise. From a poor fisherman exploited by the local aquatic products station through price monopolies to a man hauling boatloads of shimmering silver-yellow crucian carp aboard his vessel, and from witnessing a vulnerable girl being bullied while everyone dares not help to joining forces with a disheveled girl who darkens her face with soot, their partnership changes everything. She handles the accounts, grades the catch, and visits restaurants to secure buyers, while he heads out to sea, repairs boats, and ventures into distant waters. Together, they gradually carve out a better life amid the waves of Crescent Bay. On their seaside wedding day, as the wind lifts her veil, he gazes at her with a smile and says, "Mrs. Lin, I look forward to spending the rest of my life learning from you."