Period drama “The Emperor: Owner of the Mask” starring Yoo Seung-ho remains the most-watched drama series airing on Wednesdays and Thursdays.

Yoo Seung-ho stars in “The Emperor: Owner of the Mask.” (MBC)

In Thursday’s episode, the series reached 12.2 percent in ratings, according to Nielsen Korea, up slightly from Wednesday’s 11.9 percent.

Yoo Seung-ho, Kim So-hyun star in “The Emperor: Owner of the Mask.” (MBC)

“Emperor” tells the story of the Joseon crown prince Lee Sun, played by Yoo Seung-ho, who strongly believes in justice and good, struggling against the corrupt groups within the royal court.

Actress Kim So-hyun plays his love interest Han Ga-eun.

By Rumy Doo (doo@heraldcorp.com)