The first unwritten rule of the workplace: there are only two types of people in the office, the main characters and the extras. Aspiration determines destiny. In every office, there are ambitious people who want to climb up the ladder, as well as those who just want to slack off and don't have great aspirations. When people first enter the office, everyone is on the same starting line, but after a few years, the ambitious either get promoted or move on to better jobs, while the small-time employees remain insignificant. No matter how much time passes, they are destined to stay at the bottom.