Kingdom is a 2019 South Korean television series. It was written by Kim Eun-hee and directed by Kim Seong-hun. There are six episodes in season one, of which this is the third. The primary cast are (from Wikipedia):
Ju Ji-hoon as Crown Prince Yi Chang
Ryu Seung-ryong as Cho Hak-ju
Bae Doo-na as Seo-bi
Kim Sung-gyu as Yeong-shin
Prince Yi Chang, crown prince of Great Joseon, is trying to discover just what is going on with his father, the king, who is secluded in his palace. The prince is opposed by his stepmother and her Haewon Cho clan. As a result, the prince is now a wanted man. Oh, and the kingdom is threatened with zombie apocalypse.