Zi Ling came to Liluopan Junior High School to investigate the cause of her sister's death. The purpose is to get close to Gu Huai, the head teacher of the first class of junior high school. But unfortunately, Liu Mufei's intrusion disrupted all plans. But Zi Ling's good sister Zhou Yanhong's first love turned out to be... Where should Zi Ling go? However, as Zi Ling kept getting closer to Gu Huai, she actually saw her sister. So why did her sister appear in front of Zi Ling again? How did Liu Mufei become Zi Ling's brother? …