이효리
The single followed their August 2013 "Tonight", as well as their feature as the subject of the reality television show "Lee Hyori X Unnie". The song is a continuation of that relationship between artist and company colleague Lee Hyori. The song's lyrics were co-written with Lee Hyori and member, Kim Boa, with the original composition being completed by Lee Hyori. It marked the first single in which Lee Hyori compose, write and produce a song for Spica. The song is arranged by Kim Do-Hyun.