Yoo Seung-ho
Crown Prince Lee Sun
The Emperor: Owner 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 to July 13, 2017 for 40 episodes. imdb.com