이효리
In the summer of 2013, Spica was the subject of OnStyle's TV show "Lee Hyori X Unnie" in which they sought and received guidance from the former Fin.K.L member, Lee Hyori. The show was shot following Lee Hyori's promotion period for "Monochrome" and culminated in the band's comeback in August. On August 27, B2M Entertainment released a digital single, "Tonight", along with a music video which Lee Hyori and her husband, Lee Sangsun, collaborated and produced. Tonight's lyrics are written by Boa and Lee Hyori, and the original song was written by Dsign Music. On August 30 Spica had their comeback performance at Music Bank and made Lee Hyori cry for them. With this single, the group was able to reach the top 10 in the Gaon Music Chart for the week of August 25–31, ranking tenth overall and eighth on the Downloads Chart with 102,297 downloads.