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After achieving critically acclaimed success for their debut performance of the single "Twins (Knock Out)", which was performed on SBSs Popular Songs on November 6, 2005, for the first time, the group was scheduled to release an official single of the song. However, a digital single of "Twins (Knock Out)" was released instead with three more brand new singles available for download on November 8, 2005.

The full album, which included all of the singles in the "Twins (Knock Out)" digital release and several other new tracks, was released on December 5, 2005, in South Korea.

On February 12, 2006, Super Junior started to promote their second promotional single for the album "Miracle". The performance version of the single differs from the one released in the album as the performance single has an added dance break and vocal bridge in the song. In contrast to the edgy, rock-influenced feel of "Twins (Knock Out)", "Miracle" is a light bubblegum pop love song with light-hearted dance choreography. It was the second and last song to be promoted from the album.

Only twelve of the thirteen members of Super Junior are featured in this album as Kyuhyun was not added to the group until six months after this albums release.