The title song was composed by the Danish producers, Remee, Lucas Secon and Thomas Troelsen. The German singer, Sarah Connor, also bought the copyright to the song (not specified when). She released her version of the song, "Under My Skin", on August 1st. This resulted in some controversy, mainly due to some listeners believing that TVXQ had "covered", "plagiarized", or "sampled" Connor's song.However, SM Entertainment has disclosed that TVXQ had finished recording the song in June 2008 (two months prior to Connor's release) and that the Danish producers had sold the song as a 50/50 deal. (Connor is supposed to receive her copyright for Europe while TVXQ is supposed to receive their copyright for Asia). Therefore, neither of the two songs are "covers" nor "samples" of each other.
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