How much can a person change? How fragile is a person's life? How worthless is a person's emotion? Ruo Yushu, who fled back to China from abroad, accidentally met Gu Jiaming, whom he had not contacted for a long time. Gu Jiaming had already become another person, selfish, indifferent, arrogant, stubborn and lying. He had learned all Ruo Yushu's annoying traits. That was the most painful time for Ruo Yushu. All the good things at first gradually faded away, leaving only devastation. In the vast world, he is just a fragile ephemera. No one will remember him, and no one will feel sorry for him. He was humble and insignificant in life, and worthless in death. The wings of the mayfly pick up the clothes, and the worries in my heart are at my destination.