Coastal youth Chu Yuan encounters danger heading out to sea, and fortuitously rescues the trapped deep-sea dragon maid Luo Ning. Filled with gratitude, Luo Ning grants him a special ability to perceive marine life. Returning to the fishing village, Chu Yuan makes an honest living down-to-earth, always steadfast in his kind original intention. The dragon maid accompanies Chu Yuan on his adventures, gradually coming to understand human morality. Mid-journey out to sea, the two actively stop malicious acts destroying the ocean. Chu Yuan dares to take responsibility when facing issues; after weathering storms and heavy trials, the two understand the responsibility of protecting the azure sea and safeguarding coastal residents' peace, continuing to rush toward unknown ocean adventures.