Fisherwoman Chu Lingxi rescued a colorful koi that was attacked by an osprey and kindly released it, but was accidentally caught by fisherman Chen Pan. During a dispute, the two suddenly encountered a waterspout and were involved in a secret place in the middle of the river. The koi carp led the two of them to a treasure fish pond full of golden-scaled fish. The two exchanged the spirit fish for silver, but were blackmailed by the bully Qian Wanguan. In times of crisis, koi carps reveal their supernatural powers, underwater cave paintings reveal the origins of Chen Pan, a descendant of the Shoujiang fishing tribe, and the county magistrate Pei Zheng also reveals the secret of the spirit-seeking fish that cures the royal family's strange disease. The two refused to go to Beijing to be prosperous, and stayed to guard the river, open a fishing business, and live a stable life with koi carp.
