Crescent Island is a paradise surrounded by the blue sea. The residents here have called the sea their home for generations, breathing together with the fish in the coral reefs, the mangroves on the shore, and the white pheasants in the forest. Lin Yu, a young graduate of marine biology, returned to his hometown with awe of the sea, only to find that this once crystal clear sea was being eroded by hidden pollution forces - illegal sewage pipes were hidden in the cracks of the coral reefs, explosives from poachers fragmented thousand-year-old corals, and plastic garbage was piled up on the white sandy beach under the influence of ocean currents. In order to protect their homeland, Lin Yu teamed up with the old fishing village captain Grandpa, the rebellious environmental volunteer Xia Mo, and the silent ocean photographer Chen Mo to form a team of "Blue Sea Guardians". They dived into the deep sea to collect evidence, fought against armed illegal mining gangs, and used scientific knowledge to awaken the villagers' consciousness. In the life and death tests, they not only protected the ecological balance of the island, but also healed each other's inner wounds. This is an adventure epic about courage and love, and an affectionate hymn about the harmonious coexistence of man and nature.
