F.T. Island has swept various Japanese ringtone sites ahead of the release of their newest single "Theory of Happiness"!
It not only ranked #1 on Recochoku's K-pop Asia Daily Chart, but also at #1 on Dwango's K-pop ringtone weekly chart. As if that wasn't enough, it also serves as the ending theme song for an animation, as well as featuring as a CF song.
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The official single will be released in 4 versions on July 24th, but in the meantime, make sure to check out the PV for the track here.
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FT Island sweeps is one of the great ringtones I've ever used. I use it on a nokia phone. Currently, when using iPhone, I find it difficult to change ringtones.