Pre-debut Sungmin was placed in a project R&B group with
Junsu and future bandmate
Eunhyuk. In 2002, along with Typhoon, Rose and Attack, the six of them made their first television appearance in a show called
Heejun vs. Kangta, Battle of the Century: Pop vs. Rock.
Moon Hee-jun taught Typhoon, Rose and Attack on to sing
rock while Sungmin, Xiah, and Eunhyuk were taught other singing techniques by
Kangta. The six trainees separated a year later, then Typhoon, Rose, and Attack debuted as members of rock band
TRAX. The trio separated when Junsu went on to debut as a member of
TVXQ. Then Sungmin and Eunhyuk joined ten other trainees to form Super Junior 05, the first generation of rotational boy band Super Junior. In 2005, he played young Kang Dong-shin in MBC drama
Sisters of the Sea.
2005–2009: Debut, acting debut and sub-groups Sungmin debuted as part of 12-member rotational group
Super Junior 05 on 6 November 2005, on
SBS' music programme
Inkigayo, performing their first single, "
Twins (Knock Out)". Their debut album
SuperJunior05 (Twins) was released a month later on December 5, 2005, and debuted at number three on the monthly MIAK K-pop album charts. In March 2006, SM Entertainment began to recruit new members for the next Super Junior generation. 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. The re-polished group's first CD single "
U" was released on 7 June 2006, which was their most successful single until the release of "
Sorry, Sorry" in March 2009. Sungmin guest starred in SBS' Banjun Theatre drama
Finding Lost Time and played
Yoochun's high school friend. In February 2007, Sungmin was placed in sub-group
trot-singing
Super Junior-T. In July, Sungmin participated with fellow Super Junior members in
Attack on the Pin-Up Boys, a
SM Pictures production. He played the role of a pretty school boy attacked by an unknown criminal. 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. 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 October 9 to November 8.
2010–2012: DJ, musical theatre, and comeback with Super Junior in Singapore, 29 November 2011 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. The musical ran at the
Woori Financial Art Hall at the
Olympic Park from February 18, 2010, for two months. In October, Sungmin was one of 20 South Korean singers selected to record the theme song, "Let's Go", for the
2010 G-20 Seoul summit. He provided vocals along with labelmates
Seohyun,
Jonghyun and
Luna. In December, he starred in KBS drama
The President as Jang Sungmin, the ambitious son of Jang Il Joon the president. In January 2011, he was placed in
Mandopop sub-group
Super Junior-M, as one of two new members along with
Eunhyuk. They spent the next few months promoting their third EP
Perfection in Taiwan and China. In July and August, Sungmin performed as the male lead Daniel, rotating with
Ahn Jae-wook,
Um Ki-joon, and
Lee Ji-hoon, in the musical
Jack the Ripper at
Chungmu Arts Hall. In 2012, Sungmin took part in
We Got Married's spin-off program with
Sistar's
Hyorin called "Pit-a-Pat Shake" to air as a Lunar Year special. Sungmin along with bandmate
Ryeowook, took over ''Super Junior's Kiss the Radio
, when former DJs Leeteuk and Eunhyuk left due to their busy schedules. On 29 March 2012, Sungmin released his first solo digital single, "Oh Wa", the ending theme song for KBS sitcom, We Need a Fairy''. In September and October 2012, Sungmin reprised his role of Daniel, with
Ahn Jae-wook, in the Korean musical
Jack the Ripper and held its Japanese tour at Aoyama Theater in Tokyo, Japan. 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. Japanese media noted that the impact of the Hallyu Wave in general and specifically the casting of Sungmin helped build popularity for the show in 2012. 2012 was considered a successful year of musicals for Sungmin due to his performance in
Jack the Ripper musical, he was ranked by OBS's Unique Entertainment News as the second most powerful musical idol of the year, after
Kim Junsu, based on the number of tickets sold. In June 2012, Sungmin reunited with his Super Junior bandmates for their sixth studio album,
Sexy, Free & Single released on July 4. On June 25, his teaser photo was released showing a side-profile of Sungmin with a feminine look and long blond hair holding a large bouquet of
baby's breath flowers.
2013–2015: Success in acting and further activities 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 would promote the album in China. On February 14, 2013, Super Junior's fifth World Tour: Super Show 5 was announced, along with eight active members, excluding Yesung from SS5 Seoul's last date, and Heechul made comeback in SS5 Manilla Sungmin participated in all Super Shows from March 23, 2013, to February 22, 2014. On December 14, 2013, it was announced that Sungmin would be participating in his new Musical "The Three Musketeers" after group member Kyuhyun's last appearance. He worked along with label mate Key from
Shinee as the same character d'Artagnan. The first showings of The Three Musketeers ended on January 25, 2013, and returned in March 2014. Sungmin continued participating in musicals, with a comeback in
Summer Snow which was held in Taiwan for three consecutive days. Sungmin held a press conference on the same day as his Summer Snow Musical, which was on January 16, 2014. After one year and three months since their second album
Break Down, Super Junior-M released their third EP,
Swing in China on March 21. Previously on March 18, 2014, Super Junior-M had unveiled the teaser image for the EP. Sungmin returned to another showing of The Three Musketeers Musical just before comeback promotions for
Swing, which started on March 14 and ended on March 19. In February 2014, Sungmin applied to enlist as a Seoul Metropolitan Police, which would make him enlist in August 2014 but he postponed his enlistment date due to his musicals and seventh album comeback plans. On July 1, 2014, it was announced that Sungmin would be acting as the main character in
Vampire musical as Dracula. Due to former label-mate
Junsu's musical
Dracula, the musical title Dracula was renamed to VAMPIRE, as the two musicals were under the same management, but with different plots and casts. On August 5, 2014, Super Junior World Tour
Super Show 6 was announced to be held in Seoul on September 21, 2014, as its usual starting tour in Seoul. Sungmin returned on the musical stage on August 10, 2014, and returned with a comeback as a Super Junior member between Aug–Oct 2014 with their seventh album
Mamacita. Before beginning his mandatory military service on March 31, 2015, he continued to perform in Super Show 6 until the tour's stop in Macau in early March.
2017–2025: Continued solo activities and solo debut After completing his military service and getting discharged at the end of 2016, Sungmin resumed his musical solo activities. In January 2017, it was announced that he had been cast in the musical
Boys Over Flowers for his first comeback musical role. The musical was scheduled for showing from February 25 to May 7. In March 2018, Sungmin released a solo ballad "Day Dream" as the 47th track of 'SM Station' project; this was his first solo track since 2012 with the release of "Oh Wa" as an original soundtrack for the Korean drama "I Need a Fairy." In January 2018, Lee Sungmin started his own YouTube channel under the SM label, and by February 2018 he took on the name Liu and named his channel Liu Studio. He does a variety of shows, from answering letters sent in by fans to advertising different products he discovers, vlogs, video games and composing music. In March 2018, he introduced his new composed group along with his friend Haeun called "MilkyWave". They have collaborated on several songs together: Toward the Moon, You are You, Seu~Reu~Reu (Zzz), and Make the Earth Move. In November 2019, Sungmin made his debut with his first mini-album,
Orgel, meaning "Music box". The album and title song music video were released on November 22. All five tracks on the album were acoustic tracks. The mini ranked #1 in iTunes top album chart in 11 countries. On September 7, 2021, Sungmin released the digital single "Goodnight, Summer". On May 10, 2023, Sungmin released his first
trot-themed single "Lovesick".
2025–present: Departure from SM Sungmin departed SM Entertainment in April 2025, upon the conclusion of his contract with the company. He had been with SM for over 20 years. ==Personal life==