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The 90's legendary k-pop series covered by Fortyteen! It's R.ef's Breakup Formula~~^ This song was the follow-up song to R.ef's debut album, but~ he became a nationwide singer with this song^ The lyrics are heartbreaking about how it's even sadder to break up on a sunny day, but... without further ado, we danced to that song at the nightclub with all our might^^ Let's summon him!!