On November 22, Yoon So Hee was confirmed to join 'Monarch: Owner of the Mask,' which already confirmed as leads Yoo Seung Ho and Kim So Hyun. Her agency, SM C&C, stated, "Yoon So Hee is confirmed to appear in MBC's new drama, 'Monarch: Owner of the Mask.'"
She will be playing Kim Hwa Gun who betrays her household because she loves the crown prince, played by Yoo Seung Ho. She throws away everything for love.
INFINITE's L is in talks. His agency, Woollim Entertainment, said, "It's true he received the offer to appear in MBC's new drama, 'Monarch,' but he's not confirmed. He's currently reviewing it." He received the offer to play Lee Sun, a man of humble birth. He's a genius, but he's the man of a peasant, so he lives as a useless man. But he learns how to read and write with the help of Kim So Hyun's character and acts as the double to the prince.