This study examines the influence of some suspected sources of bias on perceptions of public sector corruption. These sources include dependence on two types of media as information sources about corruption: traditional and social media, positive perception of public employees, and social identification with public employees. Data were collected through a face‐to‐face survey of the general public in South Korea. The sample comprised 472 respondents evenly dispersed across the country. Through regression analysis, we found that dependence on traditional media—but not social media—significantly increased the perceived level of corruption. However, positive perceptions of and social identification with public employees were negatively associated with it, showing that these factors may skew respondents' perceptions of corruption. The results have implications for practitioners and researchers who design, implement, or evaluate anti‐corruption policies, suggesting the need for caution when making use of survey results.