Lin Xiaobo comes from a poor family and is notorious at school for being a coward. Even when bullied, he doesn't dare fight back, secretly taking on high-risk jobs to help support his family. After an accident, he unexpectedly ends up sharing the same body with Youying, a shadow agent from the parallel world of Neva! By day, he is a poor student whom anyone can bully. By night, he follows Youying through dangerous situations on secret missions. From a mismatched duo whose bodies struggle to work together to the awakening of shadow powers within him, this boy who has spent over a decade being timid finally stands up straight for the first time.