Glass Mask (Korean: 유리가면; RR: Yoorigamyeon) is a 2012 melodrama South Korean television series starring Seo Woo, Lee Ji-hoon, Park Jin-woo, and Kim Yoon-seo. It premiered on September 3, 2012 on tvN and aired on Mondays to Thursdays at 21:45 (KST) time slot.