1. Su Yao: A top student in the Department of Mathematics, with strong logical analysis ability and calm personality. Due to the disappearance of her sister Su Yue, she was involved in the world of rules, and gradually discovered the connection between her sister and the world.
2. Lu Zhiyi: Double majored in literature and psychology, sensitive and delicate, good at interpreting metaphors and emotional traps. He is Su Yao's complementary partner, and the two work well together.
3. Su Yue: Su Yao's sister disappeared three years ago. In fact, he was an early breakthroughr in the world of rules. After the failure, part of his consciousness was assimilated and became a guide, leaving behind clues of gear fragments.
4. Lin Xi (Rule Maker): Formerly known as Lin Xi, he was a barrier breaker ten years ago. After being assimilated into the world, he became a rule maker. He tried to break the cycle through wrong methods, and was finally awakened to human nature by true emotions.
