This story revolves around two teenagers of different identities and different cultural backgrounds, Fa Hua and Lan Ge, who, because of a magic weapon called "Only Pearl," were connected together to save humanity. The two teenagers have a symbiotic relationship because of the artifact, which makes the two teenagers with very different personalities need to go through a variety of tests together. With that, the relationship between the two sees subtle changes, and they begin to understand each other. Gradually, the two become as close as siblings.