Twenty years ago, Huang Mochen was withdrawn and unsocial, but he met Ke Xiaoke by chance. Twenty years later, he watched Ke Xiaoke being hugged by others, and another accident brought him back to twenty years ago, to the day when he met Ke Xiaoke again. Each of us has a time when we were young, when we were free and uninhibited, free and innocent, and there was vigorous love on campus, or a simple and shy secret love, or words of love that were sweet to the heart. If one day we are no longer together, we should act as if we were together.