This article analyses the media coverage of the Programme for International Student Assessment (PISA) by progressive and conservative media outlets in South Korea from 2000 to 2018. Through systemic content analysis, the study reveals that the tones and content of PISA-related articles were largely influenced by the political alignment between the media outlet and the government in power, rather than the actual PISA results. This finding highlights the opportunistic and circumstantial nature of Korean media coverage of PISA, guided by their contrasting educational agendas towards excellence and equity. This research reveals PISA's function as a projection screen for reflecting local political intentions and as ammunition data to protect specific agendas from criticism. By uncovering the political expediency inherent in media reports on PISA, this study illuminates the role of PISA as a politicised science that shapes educational agendas and strengthens the OECD governance.