- Protagonist: Lin Yue, a modern outdoor adventure blogger who is proficient in wilderness survival and equipment modification. He has a calm and tenacious personality and comes with a "biological illustration" system (which can analyze the creatures and resources in the treehouse layer).
- World rules: The world is composed of a "World Tree" that stretches through the sky. There are 200 independent tree houses suspended on the trunk. Each layer has a different environment (rainforest, ice, desert, poisonous fog, mechanical ruins, etc.). The layers need to be switched through dangerous ropeways or teleportation arrays.
- Survival Core: Collect each layer of "Source Crystals" to unlock permissions, repair the core of the treehouse to resist erosion, avoid mutated creatures and harsh environments, and choose to form alliances or compete with other survivors.
