Roller Coaster 将第一次感受到爱意时的感情比喻为乘坐过山车。因为不知道会冲撞到哪里，所以充满了刺激与奇妙感，在一起时会以惊人的速度愈发变大，饱含NMIXX爱意的歌曲。 这次歌曲是以URBAN HOUSE体裁为基础的朋克，Soul风格曲目，混合BossaNova节奏的同时，梦幻般的合唱给整首歌曲增添了亮点。总结来说是一首可以感受到像乘坐过山车一样，充满活力和立体感的歌曲。 Lyrics by 서지음 Composed by Justin Reinstein, Suhyppy, Anna Timgren Arranged by Justin Reinstein Original Publisher NuVibe Music Sub-publisher NUMBER K COMPANY Sessions All instruments by Justin Reinstein Background vocal by Suhyppy Vocals directed by 김연서 (Emily Yeonseo Kim), 송희진 (쏠시레), 케빈오빠 (쏠시레), Suhyppy Vocals edited by 정은경 at Ingrid studio Recorded by 서은일 at JYPE Studios Mixed by 이태섭 at JYPE Studios Mastered by 권남우 at 821 Sound Mastering Mixed in Dolby Atmos by 신봉원 (Asst. 박남준) at GLAB Studio