Currently, the most severe issue in high school education is its credit system. This system, which will be implemented in 2025, is a high school innovation policy that seeks flexible and individualized education focused on student growth. This is done by escaping from the uniform entrance-oriented education, expanding student’s options, and diversifying curriculums. This study tried to examine the linkage problems between high school credit system and college entrance, among other issues surrounding the credit system, and the related challenges in Korean language education. The high school credit and college entrance systems have a direct impact on high school curriculum organization and student’s selection of subjects. Therefore, the Ministry of Education(2018) announced plans to reorganize the college entrance system and improve its performance evaluation scheme, in order to prepare the high school credit system. Beginning in 2025, the high school credit system will be implemented by expanding the scope of application of the achievement evaluation scheme to all subjects. However, the reorganization of college entrance and evaluation systems seems to conflict with the plan of the Ministry of Education to strengthen the fairness in the college entrance announced in the 2019. In some ways, it is also a risk that functions as an obstacle to the successful settlement of the high school credit system and the normalization of high school education. In addition, the reorganization of college entrance and high school credit systems will greatly influence the status and form of Korean language education. In particular, the structural reorganization into “Common subject (, )” and “Elective subject ( and )”, in the Korean language section of the national college entrance exam, leads to a subject’s decrease in weight. Korean language subject has multiple identities as a tool subject, as well as a thinking and cultural subject. However, with the introduction of the high school credit system and a revised curriculum, it is necessary to fully discuss the nature and role of Korean language education in high school, along with the weakening of Korean language education and subject bias. The teaching of Korean language should not only provide a basic education, but also have a career subject role.