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Uploaded on May 16, 2011
As the follow-up song in her first regular album [Growing Up], "Hey (Rock Ver.)" is the rock version to IU's song "Hey" found in her 1st mini-album, even more popular than its original version. Depicting a young girl's confession as she shyly yet honestly portrays her feeling to her crush, the lively rock sounds and IU's voice combine to make it a fun yet sweet love song.