I recommend Butter because the sophisticated sound and smooth rhythm are easy on the ears.

The clean and cheerful atmosphere continues from the intro, making it pleasant to listen to.
Each member's different vocal tone blends well with the song's rhythm, so it isn't boring.
Thanks to the catchy chorus, the melody keeps playing in my head after just one listen.
It is also quite fun to watch the facial expressions and performances change with every stage.
It is a song that naturally plays when you want a light mood change.