Premise: JinSoul (also known as Kim Lip & JinSoul) is the seventh single album from South Korean girl group Loona's pre-debut project. It was released digitally on June 26 and physically on June 28, 2017 by Blockberry Creative and distributed by CJ E&M. It officially introduces member JinSoul and contains two tracks, JinSoul's solo "Singing in the Rain" and a duet with Kim Lip called "Love Letter".
Hypothesis: JinSoul's solo "Singing in the Rain" made them more money than any of their prior songs.