In 2010, Sungmin starred in the title role of musical Hong Gil Dong, alongside group mate Yesung who also played the historical figure Hong Gildong.
It played at the Woori Financial Art Hall at the Olympic Park from 18 February 2010 for two months.
However, plans changed and the company declared a halt in forming future Super Junior generations.
Following the addition of thirteenth member Kyuhyun, the group dropped the suffix "05" and became officially credited as Super Junior.
Together, they signed a contract with SM Entertainment and received training in singing, dancing, and acting.
Sungmin studied at Myongji University for his bachelor's degree. Sungmin was placed in a project R&B group with Junsu and future band mate Eunhyuk. Moon Hee-jun taught Typhoon, Rose and Attack on to sing rock while Sungmin, Xiah, and Eunhyuk were taught other singing techniques by Kangta.
In July, Sungmin's took part with fellow Super Junior members in Attack on the Pin-Up Boys, a SM Pictures production.
The musical was well-received and, due to its popularity, it was brought back to Japan for another run at the Kanagawa Arts Theatre in Yokohama the following year.For July and August, Sungmin performed as male lead Daniel, rotating with Ahn Jae-wook, Um Ki-joon, and Lee Ji-hoon, in musical Jack the Ripper at Chungmu Arts Hall.Sungmin along with band mate Ryeowook, took over Super Junior's Kiss the Radio, when former DJs Leeteuk and Eunhyuk left due to their busy schedules.On January 7, 2013, Super Junior-M released their second album, Break Down, along with the music video for the lead single of the same name.A press conference took place in Beijing on January 7, and they will promote the album in China. He worked along with label mate Key from Shinee as the same character d'Artagnan.
In January 2011, he was placed in Mandopop sub-group Super Junior-M, as one of two new members along with Eunhyuk.