In Jinghang Middle School, where science is paramount and artistic interests are suppressed, Su Wanning, a girl from the Rocket Class, hid her love for music in an old storage room on the top floor in order not to disappoint her parents, and sang anonymously on the campus platform under the name "Wan Yin". Her secrets were revealed one after another by the "science guru" Shen Yanci, but she unexpectedly discovered that the other person was her fan.
Shen Yanci silently protected Su Wanning and helped her deal with the repeated difficulties faced by her classmate Zhang Hao - from exposing the lyrics on the draft paper to secretly taking photos of singing in the attic and reporting forged recordings. Shen Yanci always came to her rescue and even agreed to collaborate with her to write songs. Su Wanning struggled between studies and music. Her mother made a promise that "only the top ten students in the monthly exam are allowed to sing." She studied hard and avoided the crisis with the prompts of the mysterious note. At the same time, she gradually suspected that Shen Yanci was the "mysterious person" who was silently helping. As Zhang Hao plots the "Campus Singer Voting" conspiracy, Su Wanning needs to grow up hand in hand with Shen Yanci while guarding secrets, fulfilling agreements, and responding to crises, and explores the courage to be herself.
