- Twin Laws: The Spirit Realm Continent is composed of "natural laws" and "mechanical laws" intertwined. Animal and plant spirits rely on the power of nature, while the mechanical core left by ancient civilizations is eroding the ecological balance.
- The secret of body fragrance: The protagonist's own "Soul Fragrance" is the mark of an ancient contract. Each scent corresponds to a different elemental ability, and is also the key to opening the forbidden door.
- Time mystery: There is a "time corridor" in Wonderland. Key characters will repeatedly experience fateful decisions at different time and space nodes, forming a closed-loop suspense structure.
