Luoyu of the Cangming Fog Sea relies on Tide-Calming Conchs to ward off the Soul-Eroding Fog. The youth Ah Chao, whose parents were buried in the seabed, is full of curiosity about the fog sea. When the barrier weakens and his clansmen are in imminent danger, he takes the initiative to go to Guixu Reef to find the Sea Heart Marrow. On the way, he meets Xi Ling, a spirit of the fog sea, and learns that the Tide-Calming Conch is her token, and the Soul-Eroding Fog originates from the shadow of greed. Ah Chao blends the Tide-Calming Conch with Xi Ling's origin, resists the temptation of greed, and brings the conch back to the island to purify the fog sea and guard his clansmen. With benevolence and care as its core, the story tells the legend of a youth's growth and otherworldly guardianship.