The purpose of this study is to analyze the aspects of mode melody techniques that appear in the music of K-pop girl group NewJeans, derive their characteristics, and use them as meaningful reference material in understanding the musical trends of contemporary K-pop. A musical analysis was performed by selecting eight songs from NewJenes, which are continuing to be a hit not only in the domestic K-pop market but also on the Billboard charts. The criteria for selecting the research subject was to analyze only songs that were as influential as possible by selecting only songs from NewJenes' music that stayed in the top 200 of the Billboard Global Chart for more than 100 days. As a research method, we first adopted an approach to analyze the use pattern of modal interchange by distinguishing common notes with regularity of major and minor scales in the use of tonal music and mode music through previous research data. As a result, the type of mode used in NewJeans' music differed in form depending on the function of the song as a whole, with a total of three types of mode used in various ways in the four songs studied, and the pentatonic scale used in the remaining song. The implication was drawn that NewJeans' K-pop presents diversity in the use of melody. It has been confirmed that K-pop is not just a performance-oriented music, but is developing to include musical depth and diversity.