Dramas with Maiden Selection

I am looking for dramas from any country that have maiden selection (an event where a lot of young women come to the palace and are candidates for servants / court ladies / concubines / a queen / an empress) as a major plot point. The women could be there willingly or forcibly.

Dramas I have already seen:

Empresses in the Palace

Empress Ki

Scarlet Heart

The Forbidden Marriage

• Under the Queen's Umbrella
• Ruyi's Royal Love in the Palace ( in the beginning arc )