Choi Dong-wook (Korean:최동욱, born November 9, 1984), better known by his stage name Se7en, is a South Korean singer from YG Entertainment. He has released songs in South Korea, Japan, China and the United States.
 2003: Debut
He began training under the management agency YG Entertainment at the age of fifteen. After four years of training in voice and dance, he made his debut in 2003. He released his debut album Just Listen on March 8, 2003.
 2007-2009: American Debut
Se7en and YG Family (including Big Bang, 2NE1, Jinusean and Gummy)made an appearance on, the now defunct, MTV K, followed by 3 concerts in Washington DC, New York City, and Los Angeles, to celebrate YG Family’s 10th Anniversary  and to help promote Se7en before his American debut. The MTV K documentary aired on December 11, 2006.
Yang Hyun Suk, (CEO of YG Entertainment) had announced that Fabolous would be featured in Se7en ‘s first U.S. single. However, due to a leak in March 2007 of his US debut song, “This is My Year” featuring Fabolous, which was produced by Rich Harrison and Lionell Davis, on Myspace and YouTube, this caused some changes in Se7en’s U.S. debut.
Se7en worked with former CEO of LaFace Records, Mark Shimmel and Grammy-winner Rich Harrison and Richcraft producer Lionell Davis on his first American album. A new production team called Noize Trip, who produced The Black Eyed Peas‘ Disco Club also contributed some work.
Se7en began promoting his English songs through a U.S. album preview party tour with his first stop at the Hiro Ballroom in New York City on March 14, 2008 (produced by Swerve Media and Base NYC). Three of his U.S. album tracks were played at this preview party. Verizon Wireless sponsored his preview parties and autograph signings for a charitable cause.
On March 10, Se7en ‘s first single “Girls” featuring Lil’ Kim was released through digital stores such as iTunes and Amazon MP3. The music video for “Girls” was also released on Myspace that same day.
 2010: Korean comeback
Se7en made an official comeback in Korea after a 3 year long hiatus on July 31, 2010 with his 1st mini-album “Digital Bounce.” The album consisted of 6 songs including a song from his American debut titled ‘Money Can’t Buy Me Love’. His 2nd track ‘Digital Bounce’ featured the rapping skills of Big Bang’s TOP. Se7en began his follow up promotions in October with the song ‘I’m Going Crazy’ which featured his long time girlfriend Park Han-Byul as the main actress in the music video. Throughout his comeback, Se7en attended many variety shows and even featured in fellow labelmate 2NE1’s hit reality show 2NE1TV, where he described his hardships in America and his hiatus. Se7en ended his promotions on the October 30, 2010.
 2011:Japanese Comeback
Se7en has recently revealed, by means of 2NE1’s Nolza Japan Concert, that he is planning a comeback in Japan after his four year hiatus since 2007. He has revealed that this album will have a Pop concept and that his first official fanmeet will be on November 6 of this year. Se7en has also revealed that he will be releasing a digital single named ‘Angel’ in November of this year, and will release a full Japanese album along side a Korean album in January of 2012.
 Acting career
Se7en accepted the lead role for the Korean drama Goong S, a spinoff of the drama Goong. The first episode of Goong S premiered on January 10, 2007 on MBC; the average nationwide rating for the entire series was 9.7%.
Goong S was the most searched and rewatched drama online; it ranked higher than its competition: KBS2 Dal Ja’s Spring and SBS Surgeon Bong Dal Hee. The drama has also gained a wide variety of support from international fans in the U.S., Thailand, Malaysia, Brazil, Australia, and Singapore.
Se7en has stated an intention to continue acting in the near future. Se7en had said that even though the drama was not of much of a success, he does not ever regret accepting the role of his character in the drama. It even helped Se7en to sing with more emotion during performances. He also mentioned that he was thankful to have a chance to work with the drama crew and take his career to a new level by acting.
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Se7en ‘s vocal range can be classified in the tenor range. His voice can be described as smooth, mellow, and sometimes mildly abrasive (see vocal belting) when songs, such as “Crazy,” “La La La,” “Hikari” and “I Know,” call for it. He often sings with a vibrato in his voice that American R&B singers are known for, and also incorporates beatboxing into many of his songs such as “Passion.” Se7en maintains an adamant belief that he should not lipsync during his live performances.
 Personal life
In June 2009, Se7en acknowledged on his website that he and actress Park Han-byul had been in a relationship for over nine years, with the couple having first met when they were seniors in high school. Se7en had previously denied rumours that they were a couple in order to protect Park’s privacy and let the relationship grow naturally. Han-byul was featured in Se7en’s music video for his song “I’m Going Crazy”. 
- ‘FIRST SE7EN’ JAPAN YOYOGI CONCERT (2006)
- 747 LIVE CONCERT (2007)
- ‘Are U ready?’ JAPAN TOUR CONCERT (2007)