<P> 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 . </P>
<P> 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 . </P>
how many episode is ruler master of the mask
how many episode is ruler master of the mask
40
40