Some stories and some people occupy most of your youth. Their stories touch you and me. Although they are so long ago, we may not know when they happened or when they ended. We call them passers-by in life; but even so, some people are passers-by in your life but at the same time they are destined to be the protagonists in other lives, such as Qing Yun and Cheng Yuqi, Dong Xiaomo and Han Yuxiao. Their stories happen around us and touch us