The Emperor: Owner of the Mask (Hangul: 군주 - 가면 의 주인; RR: Gunju -- Gamyeonui juin; lit. Ruler -- Master of the Mask) is a South Korean television series starring Yoo Seung - ho, Kim So - hyun, Kim Myung - soo, Yoon So - hee, Heo Joon - ho and Park Chul - min. It aired on MBC every Wednesday and Thursday at 22: 00 (KST) from May 10, 2017 for 40 episodes.
how many episode is ruler master of the mask
40