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Steven Yeun is a Korean-born American actor, who currently stars in the role of Glenn in the AMC television series "The Walking Dead." Other than "The Walking Dead," Yeun had a cameo in the critically acclaimed American sitcom "The Big Bang Theory" as Sheldon's former roommate Sebastian in 2010, an independent film and a couple of shorts. He has additionally completed voice work for the Crysis video game series. [+]