During an unexpected trip out to sea, Lin Zhou, an ordinary young man, rescues an injured mermaid, setting off an extraordinary ocean adventure that transcends species. Facing the dangers of uncharted waters, conflicts of interest, and tests of human nature, he remains committed to kindness and courage. Through his sincerity, he earns the trust of his companions, and through his actions, he protects the ocean and all living things. As he continues exploring the distant seas, Lin Zhou gains friendship, maturity, and a sense of responsibility, while discovering the meaning of harmonious coexistence between humanity and nature. Riding the waves and fearlessly pursuing his dreams, he will ultimately create a legendary maritime story of his own.