A yacht is suddenly caught in a violent thunderstorm. He Chuan, a ship engineer, dives into the sea to fix the danger and save his seven companions, but accidentally becomes separated from the lifeboat. At this critical moment, he awakens the Deserted Island Lord System, gaining the abilities to scan for risks and calibrate engineering equipment. After reaching the island, He Chuan builds shelters, searches for water, establishes a fishing workshop, and brings everyone together through a set of rules. Facing torrential rain, wild beasts, and communication outages, the eight survivors each put their skills to use and work together to repair an observation station while waiting for rescue. Their shared decisions gradually dissolve their misunderstandings. He Chuan finally realizes that being a true lord is not about possessing a deserted island, but about protecting everyone in times of hardship and leading his companions safely home.