Bonek also has a younger sister's voice in the new song.

Overall, it seems like a cute song

The voice that whispers in verse 2, "Oppa, I'm really mad," is said to be the voice of member Unhak's younger sister.

I was born in 12 years ago lol

The reason it's called carbonated water is because the real name was revealed, so Unhak called it that, lol.