In the shadow of the bustling city, there is a "door to the spiritual realm" that only opens at midnight. Lin Yu, a college student, accidentally obtained a jade pendant that sealed the ancient mythical beast "Zhulong", and has since been involved in disputes in the spiritual realm - Zhulong's power to control time and space has attracted the covetousness of all forces.
On a full moon night, the jade pendant guides him into the spiritual realm. When encountering a monster trap, he meets the mysterious girl Su Yao who guards the secrets of the spiritual realm. Su Yao went deep into the spiritual realm to find her missing father. The two discovered that an evil organization was trying to use the power of the candle dragon to open a channel between the spiritual realm and the human world, and release all demons to rule the world.
They gathered Zhao Xuan, who is good at swordsmanship, Li Ming, who is proficient in mechanism skills, and Wan'er, who has healing power, to work together to solve ancient mysteries and fight against powerful evil spirits, but gradually they realized that there was another manipulator behind the conspiracy. At a critical moment, Lin Yu awakened Zhulong to protect his companions. Although he defeated the evil leader, it caused turmoil in the spiritual realm, and evil spirits took the opportunity to swarm into the human world.
In order to prevent the catastrophe, Lin Yu learned to control the power of the candle dragon with the help of the Su Yao family, and started a decisive battle with his partners at the junction of the two worlds. In the end, he repaired the spiritual realm and sealed all the demons, but he fell into a deep sleep due to exhaustion. Su Yao and her friends stayed by his side, waiting for him to wake up.
