SM Entertainment project for Super Junior

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Since debut, SM Entertainment has created four subgroups for Super Junior. Every member was put into different subgroups excluding Kibum, due to his busy acting schedule. The intentions of the subgroups were part of SM's strategy to not limit Super Junior's activities, and the goal was to show that the group could accommodate different musical genres. However, this strategy was later challenged by critics, as it has influenced an overwhelming amount of music groups to create official and unofficial subgroups alike. SM announced that Super Junior will form more subgroups in the future, and possible focuses of these subgroups include a variety of genres such as rock and hip hop. Previous Super Junior subgroups will also return to the industry along with appearances of new subgroups

1. Super Junior-K.R.Y

Super Junior-K.R.Y, established in November 2006, is a trio formed by Kyuhyun, Ryeowook, and Yesung which makes up K.R.Y.in the title of the group. The company discovered that these three members developed a particular personal and subsequent fan-base that was separate from the rest of the group, and how they also had similar musical qualities. They therefore grouped these three members together to perform particular songs to target a more mature audience. Being amongst the most vocally powerful members of the group, Super Junior-K.R.Y are credited to singing mournful, R&B-style ballads, a style that has proven very popular in recent years.

Super Junior-K.R.Y's first official performance was on November 5, 2006 on KBS's Music Bank, performing "The One I Love (한 사람만을)." They have participated in the original soundtrack of the tvN drama Hyena with a total of three tracks, including the main theme. The trio also contributed tracks in two additional original soundtracks, one track in both the soundtracks of Snow Flower and Billy Jean Look at Me. Unlike Super Junior's other sub-units, Super Junior-K.R.Y has not officially released a single or album, and only participated in collaboration albums and original soundtracks. However, a new album is expected from K.R.Y in the future.

On August 1, 2010, Super Junior’s sub-unit K.R.Y. made history by opening their own concert for the first time in Japan, and upon the fans’ request for an encore, more performances were added in Kobe on the 1st and 2 November and later on, 1 and 2 December in Fukuoka. There were about a total of 22,000 people who had watched the 6 sessions of the performances. The group has successfully finished their concert in Japan and Taiwan last year. Due to ardent requests from Korean fans wanting to see Super Junior-K.R.Y.’s concert, the group decided to hold the concert in Korea .

2. Super Junior Trot

SUPER JUNIOR T
Super Junior-Trot (Korean: 슈퍼주니어-트로트), officially known as Super Junior-T (Korean: 슈퍼주니어-티) is the second official sub-unit of Korean boy band Super Junior. They are one of the few new generation singers known to have been capitalizing trot music, the oldest form of Korean pop music. Super Junior-T contains six Super Junior members, Leeteuk (the leader), Heechul, Kang-in, Shindong, Sungmin, and Eunhyuk.
Super Junior-T has released only one single in the short span of their career before they were announced to be on hiatus in 2008. The single "Rokugo" was Korea's sixteenth best-selling record and the number one best-selling single of 2007, according to the Music Industry Association of Korea.^[1] In November 2008, the subgroup returned with a debut in the Japanese music industry, releasing the Japanese version of “Rokugo.”

3. Super Junior M

Super Junior-M was formed to target the Mandopop market and debuted in 2008 with seven members: Han Geng, as the leader, Siwon, Donghae, Ryeowook, Kyuhyun from Super Junior, plus two Chinese members drafted in only for this sub-group Henry (a Chinese Canadian), and Zhou Mi. In December 2009, Han Geng returned to China to pursue a solo career. In February 2011, Super Junior members Sungmin and Eunhyuk were added to the subgroup and resumed their activites with the release of EP Perfection. The eight active members are: Siwon, Donghae, Ryeowook, Eunhyuk, Kyuhyun, Sungmin, Zhou Mi, Henry

4. Super Junior-Happy

Super Junior-Happy (Korean: 슈퍼주니어-해피), sometimes referred to as SJ-Happy or Suju-Happy (Korean: 슈주-해피), is the fourth official sub-unit of Korean boy band Super Junior. Super Junior-Happy contains six Super Junior members, Leeteuk (the leader), Yesung, Kang-in, Shindong, Sungmin, and Eunhyuk