From April 4 to April 7, 2008 the seven members of Super Junior-M were individually announced to the Chinese media in a chain of short trailer clips. The first member, Han Geng, was announced to be the subgroup leader on April 4. On April 5, Siwon and Donghae were revealed to be the second and third members. On April 6, Kyuhyun was announced to be the fourth Super Junior-M member, following the new member, Henry, as the fifth. Ryeowook and another new member, Zhou Mi, were announced to be the final two members on April 7. A trailer of all seven members was released on the group's debut day, April 8. Super Junior-M's trailer clips exceeded 1.4 million views in less than four days.
Super Junior-M debuted in Beijing on April 8, 2008 at the 8th Annual Music Chart Awards, simultaneously with the release of their first music video, "U" on Sohu.com. They released their debut album Me in selected provinces of China starting April 23, 2008. A Korean version of the album with three bonus Korean-language tracks was released in South Korea on April 30, 2008. A modified version of the album was released in Hong Kong, Singapore, and Taiwan on May 2, 2008. Though a majority of the tracks in the album were Mandarin remakes of Super Junior's previous Korean hits, reviews were generally positive. Hong Kong Cantopop singer, Hins Cheung, critiqued the album favorably, saying that the album contains "international-level music" and that the group is "vocally-talented".
A month after their debut, Super Junior-M won their first award, Asia's Most Popular New Group, at the 5th annual Music King Awards in Macau on May 25. They took home another three awards that year. On December 27 and 28, Super Junior-M held their first concert, the Super Junior-M Show, in Hong Kong.
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. They appeared in an episode of the second season of TVB and HunanTV's collaboration show, Strictly Come Dancing, which made the show's ratings increase to 5.01%, ranking it the third most watched show ever in all of China. Super Junior-M's appearance in the talk show Behind Story (Chinese: 背後的故事) also increased ratings. The show had the highest ratings during their time slot, with a strong 4.05%. Separated into several weekly episodes, the group's appearance in their first episode on the challenging game show Bravely Going Forward (Chinese: 勇往直前) in early August gave the show the highest ratings during that time slot as well. In August 2008, Han was cast in the idol television drama Stage of Youth, a mini-drama dedicated to the 2008 Beijing Olympics. Han portrayed Xia Lei, a youth who aspires to be a famous dancer. Other members of Super Junior-M gave cameo appearances in the final episode.
In September 2009, Super Junior-M released their mini album, the EP Super Girl. The album garnered them a nomination for Best Vocal Group at the 21st Golden Melody Awards. The EP's title single "Super Girl" is Super Junior-M's most critically successful song to date, winning numerous accolades for its composition and performances.
