A plane crash threw outdoor coach Qin Yu into the vast sea. When he woke up, he was lying alone on the beach of a strange desert island, with only half a bottle of fresh water, a saber and the obsession to find his lost girlfriend Lin Nian.
In a desperate situation, the mysterious "sign-in system" comes. Sign in every day to obtain survival supplies; explore special locations and unlock hidden rewards. From a rusty toolbox to his first homemade machete, from a simple hut to a sturdy wooden house, Qin Yu has firmly taken root in this uninhabited land.
However, a desert island is not a pure land. A diary left behind by a predecessor left a warning: "Don't believe the fog on a full-moon night." The looming shadows in the fog, the mysterious sea map in the sunken ship's safe, and the militants who suddenly landed on the island have wrapped up this seemingly isolated island into a huge mystery.
When Qin Yu rescued surgeon Lu Yao and took in veteran Wang Zheng and his companions, lonely survival gradually evolved into teamwork and power confrontation. They discovered a dusty laboratory underground and learned the horrifying truth - this island was once the base for a human evolution experiment, and the leakage of source energy fluid was quietly changing all living things on the island. The images of Lin Nian's imprisonment three months ago pushed Qin Yu to the edge of having to evolve.
To live from scratch, from being alone to gathering a resistance army, from passive survival to actively exploring the truth - when the full moon rises again, what awaits him deep in the fog, is it a reunion, or is it a bigger conspiracy?
