He replaced bandmate Kangin as one of the DJs at Reckless Radio, with Girls' Generation members from June 2007 to July 2008.
In 2008, he became a member of sub-group Super Junior-H and participated in a short half-hour drama Super Junior Unbelievable Story with Leeteuk.
After completing his military service and getting discharged at year end 2016, Sungmin resumed his musical solo activity.
In January 2017, it was announced that he had been cast in the musical Boys Over Flowers for his first comeback musical role.
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 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.Sungmin played himself, a member of Super Junior-T who is constantly overshadowed by his members.In 2009, he starred as male lead, Ro, in musical Akilla at the Hanjeon Art Center in Seoul from 9 October to 8 November.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.In January 2011, he was placed in Mandopop sub-group Super Junior-M, as one of two new members along with Eunhyuk.