Toheart (band)

On February 20, 2014 S.M. Entertainment released a teaser announcing Toheart, a special unit duo consisting of Woohyun of Infinite and Key of Shinee.^[3] The release was followed by a second prologue teaser which was released on February 27.^[4] After the release of a music video teaser on March 4, 2014^[5] and a track preview video a few days later,^[6] Toheart debuted with the mini album Delicious and the music video for the title track was released on March 10.^[7] On the same day, the duo held their first showcase in the Coex Artium, hosted by bandmates Minho and Sungkyu.^[8][9] Jeff Benjamin from Billboard praised the duo's vocals, and also the choreography and on-screen charisma.^[10]

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.^[2][11] On April 7, 2014, the duo followed up their promotions with "Tell Me Why" featuring Woohyun's bandmate Sungyeol’s younger brother, Golden Child Daeyeol as well as actress Mun Ka-young.^[12] The song was requested most by fans and was produced by Sweetune. It tells the story about a man’s unwillingness to let a lover go.^[13]