In 2042, the "Polar Tide Night" struck, and the world's land was swallowed up by floods. Billions of people perished, and the only survivors drifted in the sea surrounded by sharks.
Former climate scientist Lin Shan woke up on a rickety raft with a faint pain from the burn scar on her left hand, surrounded by only putrid garbage and crashing waves. Hunger and thirst have not yet been relieved, and the shark fins passing under the water are approaching death - she must collect resources as soon as possible to build a safe floating island.
On the way, she rescued Li Yuan, a 16-year-old boy who was drowning, and met Alei, a former special soldier with a disabled left leg, Huang Ying, a doctor carrying a medical kit, and Samira, an investigative reporter with sharp eyes. Several people walked together, and the raft gradually expanded, but crises also ensued: the powerful people of Chaoguan Castle monopolized fresh water and anti-shark medicine, black market transactions were hidden in the slums of Breaking Waves, and the mysterious "Blue Domain" energy was both life-saving and deadly.
Shark raids, resource competition, and unknown hidden dangers lurk, and the trust among survivors is repeatedly stretched in desperate situations. Lin Shan hides secrets related to the flood, Alei is persistent in searching for his lost daughter, Huang Ying's medical kit seems to have hidden secrets, and Samira is always recording everything secretly.
They disassembled leftover letters and captured radio signals, trying to piece together the truth about the flood and find the legendary "oasis" that was not flooded. But in this vast sea, the most terrifying thing is never the shark, but the human nature swaying in desperate situations - can they cross the sea of sharks and hold on to mankind's last hope?
