High school student detective Lin Yu was unfortunately given the poison "FEMS5201" while tracking the mysterious black organization "The Secret Network of Shadows", and his body shrank into an elementary school student. He lived in the home of his childhood sweetheart Su Yao under the pseudonym of Stardust. At the same time, female high school student Chu Yue also suffered the same fate. She was taken in by Uncle Lin Yu and changed her name to Yue'er, and became classmates with Lin Yu. Lin Yu relied on the resources of Su Yao's father's detective agency to secretly solve various cases, and worked with Chu Yue to gradually uncover the mystery of the black organization. During this process, Lin Yu and Su Yao kept in contact through voice changers and phone calls, and their relationship gradually heated up during the special exchanges. At the same time, they also faced the crises and challenges of the black organization. In the end, Lin Yu and others successfully prevented the terrorist attack of the "Shadow Secret Network", recovered their bodies, achieved positive results with Su Yao, and started a new life. The days when they talked using a voice changer became an unforgettable memory on their love journey. The novel combines elements of reasoning, adventure and love, with the plot ups and downs and full of suspense.
