The Tang Dynasty was a prosperous and splendid time. In Changle, a coastal town with a developed shipbuilding industry, a human woman named Lu Li disguised herself as a man and sneaked into the shipyard, hoping to show her skills in the shipyard and realize her dream of sailing. The mermaid prince Wu Julan also came to the shipyard with a mysterious mission. The two met each other and developed a pure love. As Lu Li and Wu Julan fell in love, the conspiracy behind them gradually surfaced. Lu Li struggled painfully between family affection and love. In the end, Lu Li and Wu Julan resolved their hatred with love, and humans and mermaids finally coexisted peacefully and shared the prosperity of the prosperous times.