Yoon Sung-hyun is a South Korean film director and screenwriter known for his work in the Korean cinema industry. He gained recognition for his debut feature film, Bleak Night, which was released in 2010 and received critical acclaim for its storytelling and direction. His films often explore themes of youth, relationships, and the complexities of human emotions. In addition to Bleak Night, Yoon Sung-hyun directed the film The King’s Case Note in 2017, showcasing his versatility in handling different genres. His unique storytelling style and ability to connect with audiences have established him as a notable figure in contemporary South Korean filmmaking.