The purpose of the study is to reconceptualize basic competency of Korean language arts for non-Korean-born juveniles (focussing middle school age, 12-16) with multicultural backgrounds. I investigated "Lebenswelt (life-world)" of non-Koreanborn juveniles with multicultural backgrounds based on archival research, survey data, participation observation, and a semi-structured interview focusing on basic competency of Korean language arts and how respondents study Korean language arts. Based on an analysis of these data, I reconceptualize basic competency of Korean language arts, emphasizing the ``attitude of Korean language use`` to non-Korean-born juveniles with multicultural backgrounds.