This study examines adolescents' media use after receiving media education, specifically, media education received through Newspaper in Education (NIE) at school and parental mediation at home. The study verifies whether media education stimulates social participation by analyzing adolescents' self-expression. Data collected through the Korea Press Foundation's 2019 survey on media use among students aged 10 to 18 in Korea (N = 1,905) were analyzed. Students who experienced NIE used various types of media to access news and consume news more sensibly. This type of news use influenced adolescents to become more active in self-expression and encouraged social participation. In addition, the relationship between parental mediation and social participation is sequentially mediated by adolescents' sensible news use and self-expression.