The rise of the "gig economy" and digital platforms has made it increasingly common for workers to hold more than one job simultaneously, a phenomenon often called "moonlighting" or side employment. Yet in China, we know surprisingly little about who these workers are, how prevalent this practice has become, and how it has changed over time. This project uses data from the China Family Panel Studies (CFPS), one of China's most comprehensive nationally representative household surveys, to construct a systematic descriptive portrait of individuals who engage in side employment. Undergraduate students will investigate trends in side-job participation rates across survey waves, compare the demographic and socioeconomic characteristics of side-job holders versus non-holders, and map the sectoral and working-hours distribution of side employment. The findings will lay critical descriptive groundwork for understanding the causes and consequences of multiple job holding in contemporary China.