A considerable shift from their usual fusion of dance-pop and energy, Doughnut is a sentimental ballad that pursues the mellow aspect of citypop, drenched in intertwining chords, and as the chorus ends in a minor 7th, the song plays into the frustrating loop of love. It's quite fascinating how a song that might've faded in relative obscurity as a b-side for a regular Twice album would be marketed as the main single in Japan - yet I'm sure it'll be a welcomed change, particularly in Japan.