Kyu-Hyuk Sim, also known as Shim Kyu-hyuck, is a South Korean voice actor born on February 9, 1982, in Daejeon, South Korea. His voice acting career spans animated series, films, and theatrical releases. Among his notable roles is Park Hyung Seok in the series Lookism. He voices the Rational Cell in Yumi's Cells and its film adaptation Yumi's Cells: The Movie. In the series A Day Before Us, he plays Han Do Yoon, and he reprises the role of Do-Yun Han in A Day Before Us ZERO and A Day Before Us: Merry Christmas!. His film work includes providing the voice for Hyunwoo in Shinbi's Apartment: The Secret of the Golden Goblin and roles in the later Shinbi's Apartment films Shinbi's Apartment Special: The Red-Eyed Grim Reaper and Shinbi's Apartment 10th Anniversary Movie: Summon Again. Additional film credits include Yurang in Colossus: The Child of the Wind, a role in Pororo: The Movie, and a role in Ghost Messenger. He also voices Park Eun-yeong in the series Homeless.