Karl Yune (born April 16, 1975) is an American actor. He is best known for his role as Maseo Yamashiro in the DC comics TV franchise Arrow, as Tak Mashido in the sci-fi film Real Steel, and as Koichi in the film Memoirs of a Geisha. His first lead role was in the cult thriller Anacondas: The Hunt for the Blood Orchid, as Tran.
Yune, a Korean American, was born and raised in Washington, D.C. Yune was educated at Georgetown Preparatory School, an American Jesuit college preparatory school, one of the most selective and oldest all-boys school in the United States. Yune studied business, literature, and philosophy before he switched to a major in theater at Columbia University School of the Arts in New York after winning the role of Romeo for a presentation of Romeo and Juliette.
Yune got his first lead role in a studio film as Tran, one of the guides in Anacondas: The Hunt for the Blood Orchid. He has also appeared in Forbidden Warrior, and Memoirs of a Geisha, as well as in the short films Miracle Mile (which received several awards), and Hold Up. He also acted in various Off-Broadway plays, and has done fashion modeling. Yune appears in the third season of Arrow as Maseo Yamashiro, (the Arrow's friend and mentor) who later becomes 2nd in command of the League of Assassins, and is also married to Katana, aka Tatsu Yamashiro.