Yun Yong Sik is a South Korean voice actor known for his work in Korean-language dubs of animated series and films. He is recognized for providing the Korean voice of Bichan in the Star Wars: Visions volume two episode Journey to the Dark Head, which premiered on Disney+ on May 4, 2023. His name also appears in various credits as Yoon Yong-sik.

In addition to his role in the Star Wars franchise, Yun Yong Sik has voiced characters in several other notable animated projects. His work includes the roles of Hamster and Seatus in Pororo: Underwater Adventure and Papa Smurf in a Korean dub of The Smurfs. He has voiced multiple characters in the Tobot series, including Tobot Steel, Tobot Krome, Tobot Iron, and Tobot Heavymetal in Tobot: Daedo's Heroes Season 3. His other dub credits contributing to the Korean versions of international animation include Shaka in One Piece, the voice of Buster Moon in Sing, and a variety of characters in SpongeBob SquarePants and The Patrick Star Show, such as Gary the Snail, Bubble Bass, and the Flying Dutchman.

Over the course of his career, Yun Yong Sik has developed recurring professional collaborations with other voice actors, having worked with Kim Hyeonsim on multiple titles. His portrayal of the Sith Lord Bichan in Star Wars: Visions is a notable achievement, as the episode was produced by the acclaimed South Korean animation studio Studio Mir, known for its work on The Legend of Korra, and was highlighted by critics for featuring one of the best lightsaber duels in the Star Wars saga.