The title song is a new work done by Lee min-soo and Kim eana togtheter, and they got their inspiration from the Anderson fairy tale [ The Red Shoes], which is about a red shoe that if you wear it, you will dance no matter of your own will.
The song has 1930s big band swing mixed with classical and vintage parts in it. The session work is also done in a 1930s classical swing style. In order to do this, the master of drama/animation/musical music,Toyama Kazuhiko, and under his direction, the best big band of Japan worked together. It was done in a improvisation manner, and here Lee min-soo's dramatic song line and the chorus worked well with to make a 'big' music.