[1] After a year-long hiatus, the group returned with additional Super Junior members Eunhyuk and Sungmin, following with the released of their second EP Perfection in February 2011.

On April 3, 2008, SM Entertainment announced their official name to be Super Junior-M, with "M" representing the word "Mandarin".

[7] Many fans boycotted Super Junior's products and held silent protests in front of SM Entertainment's main building in Seoul, holding signs of the "Only 13" slogan.

[12] They released a statement through the media, stating that they would obtain all chances to prevent SM Entertainment from adding new members and to keep Super Junior as only thirteen.

A Korean version of the album with three bonus Korean-language tracks was released in South Korea on April 30, 2008.

[18] Though a majority of the tracks in the album were Mandarin remakes of Super Junior's previous Korean hits, reviews were generally positive.

[21] Following their debut performance in April 2008, the group made a few successful guest appearances in many chains of entertainment variety shows to promote their album.

[22] Super Junior-M's appearance in the talk show Behind Story (Chinese: 背後的故事) also increased ratings.

[24] In August 2008, Han was cast in the idol television drama Stage of Youth, a mini-drama dedicated to the 2008 Beijing Olympics.

Han, however, stayed in China and signed under a new management, releasing his debut solo album Geng Xin in July 2010.

In February 2011, Super Junior-M resumed their activities with two new members from the main group, Eunhyuk and Sungmin, with the release of EP Perfection.

[30] The repackaged version of the album was released on April 29, debuted at number 2, and stayed on the chart for 10 weeks.

[34] After one year and three months, Super Junior-M announced to release their third EP Swing in China on March 21.

[35] To commemorate the release of their third EP, Super Junior-M held comeback press conference held at the Dine Theater located in the CBD (Central Business District) in Beijing on March 22, with the live broadcast views by 1.07 million users.

[36] The sub-unit also plans to made their comeback stage on China's CCTV music program in the same day.

[39] Their third EP officially released in Korea on March 31, which contains seven-track including the Korean version of "Swing".

On April 30, 2018, Henry decided not to renew his contract with SM and left Super Junior-M.[42] In December 2009, Hangeng departed from the group after filing a lawsuit against their agency S.M.