Su Zao and Zheng He, Xu Jing and Li Renren. The four people went from their youthful and ignorant first love in high school to their separation in college, and finally to their meeting at work. Four people, two relationships, no one can judge whether they are good or bad. Only Su Zao and Zheng He, Xu Jing and Li Renren back then and Su Zao and Zheng He now, Xu Jing and Li Renren know what it feels like. Four people, two relationships, two endings, nothing spectacular, but it is the youth and frivolity of our time.