A new song written as the theme song for "JO1 Exhibition" JO1 in Wonderland!".

For the first time, member Takumi TAKUMI is responsible for producing all of the lyrics and composition.

The title ``HAPPY UNBIRTHDAY'' is inspired by the line from ``Alice in Wonderland'' that says ``Happy day,'' and the lyrics include looking back on JO1's history and moving forward by looking only ahead. It contains the message of going.

A playful song with a Funk x Hip Hop sound and 11 members' vocals that makes you imagine showtime.


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