This article tells a series of youth stories with the heroine Su Qianqian as the protagonist, whether happy or sad, loving and being loved. When we were young, we were just young and ignorant teenagers who did not know how to love or cherish. The youth that passed away in those years was like the most beautiful years. A beautiful firework blooming in Huali was so unreal, as if it were an illusion, disappearing so suddenly, like an hourglass in the hand, slipping through the fingers so easily, leaving fragments of memories scattered all over the world. In the fleeting years, we are just a finger in the quicksand, and youth is only there in a flick of a finger. This article only commemorates our lost years.