Yeong-Jun Si is a South Korean voice actor known for his deep and distinctive voice. He was born on July 16, 1969, and stands at 192 cm tall. He began his career in 2000 after joining the CJ ENM (formerly Tooniverse) voice acting剧会 as part of its fourth generation.

His early career was marked by a voice that was considered too low, but over time, his deep tone became his signature and made him an irreplaceable presence in the industry. He is also recognized as one of the tallest voice actors in South Korea. He is married to fellow voice actress Kim Bo-young.

Yeong-Jun Si is perhaps most widely recognized for his long-running role as the voice of Sergeant Major Giroro in the Korean dub of the popular anime series Keroro Gunsō. This role is considered one of his representative characters.

While information on specific roles can be difficult to verify, he is known to have voiced a wide array of characters across different media. In addition to the roles mentioned in the query, his extensive filmography includes a variety of anime, animated films, and video games. He has provided the Korean voice for characters such as Yasutora Sado in Bleach, Alex Louis Armstrong in Fullmetal Alchemist, and Might Guy in Naruto. His work also extends to western animated productions dubbed into Korean, including the role of Ozai in Avatar: The Last Airbender and Megatron in Transformers Prime. In the realm of video games, he has voiced characters like Volibear in League of Legends and has contributed to the Korean dub of the game Arknights.

His career demonstrates a consistent and prolific presence in the Korean voice acting industry, with a body of work that spans numerous genres and formats.