CLC released the special digital single, "Eighteen" after less than a month of debut. "Eighteen" is a 60-70's motown and synthpop 80's song that expresses youthful love experienced when you're 18. On March 17, the group started to promote the song by performing their first stage on
KBS's
Music Bank.[1][5]
^2015년 17주차 Digital Chart (국내) [Week 17 of 2015 Digital Chart (Domestic)]. Gaon Music Chart. April 18, 2015. p. 4. Archived from
the original on August 15, 2016. Retrieved August 4, 2016.