In-Wan Yoon is a manhwa artist from South Korea but is known in Japan to be the author of his original story, Blade of Phantom Master. He has also created the story of Island, a manhwa that he had written with Yang Kyung-il as the illustrator. After finishing Island, he then wrote The Island, a novel that tells the past of the characters in the manhwa. Other works that he is known for are Devil Defense and Shin Angyo Onshi.