The friendship of four girls, An Ran, Li Guoguo, Zhu Zhu, and Huo Jiajia, spanned 15 years, from their youthful college years to their adult work, and finally to each of them choosing to belong. During this period, they experienced the erosion and baptism of time. In the end, they made the choice they thought was good because of their different personalities, family backgrounds, dream pursuits, and experiences. There is no hustle and bustle, no betrayal, no lamentation, and no abortion. What is there is just the epitome of every ordinary person's unpretentious youth and their growth in reality, and youth is slowly narrated. When I think about it, the river waves are thousands of miles away, and the mist is heavy at dusk and the sky is vast.