(born October 6, 1972) is a South Korean actor and singer. After he made his debut in the KBS drama Feeling
) in 1994, Ryu pursued a singing career.
In December 12, 2004, Ryu went with a Taiwanese actress to Singapore for the presentation of the Star awards to Singaporean actors in the Mediacorp Star Awards 2004. The event was broadcast on Mediacorp's TV Channel 8.
Ryu revealed that he is the 14th-generation descendant of the Joseon Dynasty Prime Minister, Yu Seong-ryong.
Ryu Si Won was nicknamed "Ryucifer" (Ryu+Lucifer) because he killed a person back in 1995 after accidentally running down a pedestrian while he was driving his Le Mans late at night. He was investigated but did not get charged against any crimes as he made a settlement with the victim's family, but the tag of a murderer still follows him. Ryu is an amateur car racer and still enjoys his hobby to this date, which only fuels people's accusations against him.
After one of the dramas he appeared in-"Beautiful Days"- was aired in Japan, he has become very popular there. He's been very active both as an actor and a singer in Japan lately.
2009 - Style (SBS)
2007 - Joshi Deka! (TBS)
2007 - Dondo Bare (NHK)
2006 - Koi no Kara Sawagi Drama Special Love Stories II (NTV)
2006 - Wedding (KBS)
2003 - She is Cool (KBS)
2002 - Sunlight (MBC)
2002 - Since We Met (MBC)
2001 - Beautiful Days (SBS)
2000 - Secret (MBC)
2000 - Honesty (MBC)
1998 - Paper Crane (KBS)
1998 - Purity (KBS)
1998 - Until the Last Day (MBC)
1997 - How to Meet a Perfect Man (KBS)
1997 - Propose (KBS)
1997 - A Happiness is in Our Hearts (SBS)
1996 - Until We Fall in Love (KBS)
1994 - The Blue Sky (KBS)
1994 - A Campus Love Song (MBC)
1994 - Feelings (KBS)
Album - South Korea Release
Album - Japan Release
2004 約束 (yakusoku)
2005 夢 (yume) (originally released in South Korea in 1999)
2005 秋桜 (kosumosu)
2006 ASIAN BLOW
2007 With You
2008 蒼天の愛 (Souten no Ai)
2009 Ryu Siwon Single Collection
Single - Japan Release
2005 "ひまわりのRhapsody" (himawarino Rhapsody)
2006 "夏の夢／好きです、好きです" (natsuno yume/sukidesu sukidesu)
2006 "Only One"
2007 "花の首飾り"（hana no kubikazari)
2008 "愛してる" (aishiteru)
2008 "君と僕" (kimitoboku)
2009 "Cafe Wonderland"
KBS Best New Actor Award (1996)
KBS Most Popular Actor Award (1997)
KBS Most Popular Actor Award (1998)
KBS Best Actor Award (1998)
TV Most Popular Award (35th Paeksang Arts Awards, 1999)
MBC Best Actor Award (2000)
New Artist of the Year Award (19th Nippon Gold Disk Awards, 2005)
Most Popular Award (47th Nippon Record Awards, 2005)