- His music video "Shall We Dance with Dr. Lim" (2014) comprises what is arguably the most star-studied ensemble of cameos in music history. included Baek Ji Young, Epik High, Sistar, Dong-yup Sin, Keoltu, Young-Ja Lee, Daniel Choi, Shin Ha-kyun, Eun-kyeong Lim, Chang-ryeol Kim, Kyeong-lim Park, Oh Ji-ho, Lee Beom-su, Kam Woo-seong, Seo In-Guk, Jin-pyo Kim, Kong Hyeong-jin, Do-hyun Yoon, Im Seul-ong, Ji-won Eun, Oh Hyun-kyung, Ailee, Kang In, Hye-Sung Shin, Ko Chang-seok, On Joo-Wan, Oh Jung-se, K.J. Choi, Han Chae-ah, Jun Hyun-moo and Apink.
- He is the father of three children.
- Owns a food restaurant called "a glass of soju".
- He love Ennio Morricone's score.
- Best friend of Lee Byung-hun.
- Retired from the singer career in 2003, but made a comeback six years later.
- Was originally slated to star in Scandal Makers (2008) but the role was given to Cha Tae-hyun instead.
- His birthday is also the anniversary of Paul Walker's death.
- Appeared in 2011 stage play called 'Radio Star'.
- Broke ribs while filming Traffickers (2012).
- He attended Joongana University, South Korea.
- Released his out of retirement new album "Return to My World". [March 2009].
- Of his songs, his favorite song was 'A Glass of Soju'.
- The first song he ever wrote before he became famous was a song 'Already to Me'. this song was became his debut song.
- Is good friends with group 'DJ DOC'.
- Parodied by his movie Beat (1997) on Saturday Night Live Korea (2011).
- His farther was a disabled ex-servicement in 6.25.
- Voiced in South korea version commercial for Coca-cola in 2008.
- Fan of Korea baseball team Doosan Bears.
- Appeared in 2009 stage play called 'Laundry'.
- Was offered for the role of Choi Man-Shik in Tidal Wave (2009) but passed out due to schedule conflict.
- His 1997 album "Again" is the biggest selling album in his of singing career.
- A fan of thriller and horror films.
- Started in acting when just 17 years old.
- He has made three films with Kim Hee-won: Scout (2007), Fortune Salon (2009) and Twilight Gangsters (2010).
- Considers Scout (2007) his best film.
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