Ryu Seung-gon is a South Korean voice actor affiliated with the Munhwa Broadcasting Corporation (MBC) voice acting division, where he began his career as part of the 17th open recruitment class in 2004. He transitioned to freelance work in 2007. He was born on November 12, 1980.

Ryu Seung-gon has built a diverse portfolio of voice work in animated series and video games. He is known for his role as Yuma Tsukumo in the Korean dub of Yu-Gi-Oh! Zexal. His filmography includes the character Lee Jin Seong and Park Jong Gun in the 2022 animated series Lookism, and he voices Rookie in the long-running children's series Tayo the Little Bus. In 2024, he voiced the characters Liam and the Butler in Heartsping: Teenieping of Love.

His work extends significantly into video game dubbing, particularly for the developer HoYoverse. He provides the Korean voice for the character Jing Yuan in the game Honkai: Star Rail. Prior to this role, he also lent his voice to Thoma in the Korean dub of Genshin Impact. In the Kamen Rider franchise, he voiced the Korean dubs for Yuto Sakurai in Kamen Rider Den-O and Hiiro Kagami in Kamen Rider Ex-Aid.

Regarding the specific roles mentioned in the query, the character Jian Xin from the series Gaiking: Legend of Daikū-maryū is confirmed to be voiced by Ryu Seung-gon in the Korean version, where the character is named Soryong.