About a group of friends who were born in the early 90s, and later focuses on their career in the automobile industry. When Chen Yi duo was nine, a young boy named Bi Lai fu suddenly appeared in her home for a short stay. The two initially did get along, competing on everything at home and in school. At the same time, Lai Fu befriends a group of loyal friends, but their playful and chaotic nature worries the adults. With the upcoming high school examinations, the youths each pursue their onward journey. Lai Fu and Yi Duo also faces the problem of work, love and life. As the year 1998 arrives, the automobile industry also undergoes a rapid development and change. The old bicycles are no longer in trend, and continue to see a decline in business and sales. In order to preserve their generation's memory, Lai Fu decided to rent an assembly workshop, and think of new ways to innovate and revive the product. He gathers again with his former friends, working together on the business idea. They use new ideas and concepts, making the "old" bicycles "young" (in trend) again.