The soul of an unknown little demon who was on the verge of death was sealed in a wooden sign to protect the person who wore it. Once the wearer died, her soul possessed the wearer. In order to help the wearer fulfill his wish to find the murderer who killed her, she came to the long-lost world to search for her long-lost emotions, and to find the murderer who killed the wearer. In the end of searching for emotions, she had already fallen in love with the person who always stands with her.
Concept: It tells the story of an unknown little demon who was sealed in a wooden sign and returned to the world in the body of a host. In the process of exploring the cause of the host's death and retrieving emotions, after escaping from the whirlpool of house fighting, he moves forward side by side with like-minded people, and finally achieves the story of self-salvation and emotional perfection.