Gyeng Su Hyeon is a South Korean voice actor known for his work in Korean-language dubs of Japanese anime. Born on April 1, 1974, he began his voice acting career after joining the voice acting division of On Media, known as Tooniverse, in 2003. He later transitioned to freelance work in 2006. In addition to anime, his career has also included dubbing roles for foreign live-action series.

Among his most recognized anime roles is the character Tsukune Aono, the human protagonist navigating a school for monsters, in the supernatural comedy series Rosario + Vampire as well as its second season, Rosario + Vampire Capu2. His other notable anime voice credits include Kei Kurono from the science fiction series Gantz and Youhei Sunohara from the drama series Clannad. His broader voice work has also extended to major franchises such as Naruto and Bleach. Regarding the role of Celestine in Ah! My Goddess: The Movie, available records consistently list a different actor for this character in both the original Japanese version and the English dub, and the Korean dub credit for this specific role cannot be verified with the provided information.