"Mr. Simple" is a song recorded in two languages (Korean and Japanese) by South Korean boy band Super Junior. The Korean version was released as the lead single off their fifth studio album of the same name digitally on August 2, 2011, via SM Entertainment. In Japan, the single was made available via Avex Trax on December 7, 2011. The song was released along with the rest of the album's tracks on August 2, 2011, and has topped online charts hours after its release.

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