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ToHeart is a K-Pop boy duo formed by WooHyun from INFINITE and Key from SHINee in 2014. It is a collaboration between SM Entertainment and Woollim Entertainment. Both WooHyun and Key stated that it was their idea to create this unit, since both are friends and they had interest in working with each other. They didn’t expect to do a singing collaboration project, instead thinking of photoshoots and similar. On February 20, 2014 S.M. Entertainment released a teaser announcing ToHeart, a special unit duo consisting of WooHyun and Key.