Everyone has their own youth melody. Lu Sangsang thought, what is her youth? She has never been crazy, never been rebellious, and has never experienced school violence. "Oh my God!! Is my youth just a pool of stagnant water?!" Lu Sangsang thought in annoyance. Suddenly, her eyes widened because she remembered the diary she had written for 3 years. She thought, this is all her youth. About the left side, about youth.