Youth is a gorgeous lonely city, and we are all watching the moment when the city gate opens. The proud Mo Chen, the easy-going Zhao Yang, the quiet Yang Zifei, the strong Su Xue, Huang Ke, Wang Yunhan, and Zhang Lin. Behind those little shining memories are years that have been washed away by the passing years and will never be seen again. Love and friendship are the two skylights of the lonely city, through which rays of sunshine pass. Family affection is the hidden side door, which will always be unbreakable. Dreams are the most magnificent city gate. After faith, you will never be lonely again. During that most fearless time, isolated cities kept colliding with each other, but who could really escape?