4 Cait Sith is the second single album by South Korean girl group Gugudan.

[1] In November 2017, member Soyee had gone on hiatus in order to fully recover from a shoulder injury that she had since prior to her debut.

[3] On January 24 at midnight KST, Gugudan released "Waltz A Cappella", a teaser video for the title track, "The Boots".

On January 25, Jellyfish Entertainment revealed that Gugudan's single album was pushed back, and would instead be released February 1.

The next day, at midnight KST, the release schedule was revealed along with the track list which contained four songs.