Happiness is like the flowering period, which blooms till the end of the year. Our love stays in that mid-summer and sighs alone. The love between us is as light as air. If you don't know how to cherish, the longing will expire. The love between us is as heavy as air. The more I want to escape, the more addicted I am. And the memories are too crowded and I can't breathe. I can only embrace the air (song "Love is like air"). Seven years ago, Xia Aiqiao's happiest thing was to always be the little tail of Xia Aiqing and Zixuan. Every time he glared at Zizixuan, he would reveal his cute little tiger teeth and hold Xia Aiqing's hand, smiling contentedly. Seven years later, Xia Aiqiao finally understood that people must learn to grow up. She only felt that the beauty of the past seemed like a world away, and lamented the impermanence of the world.