Park Shin Hye as Empress Hyebin 

Song Joong Ki as Imperial Duke Wooyoung (the empress' official consort.) 

Park Minyoung as Grand Princess Hyesoo (the empress' younger sister.) 

EXO-K as several consorts of the Empress (in their respective title at the beginning of the story) 

• Byun Baekhyun as Honorable Lord Byun (Rank 6)  
• Park Chanyeol as Honorable Lord Park (Rank 6) 
• Kim Jongdae as Lord of Generosity (Rank 5) 
• Kim Jongin as Honorable Lord Kim (Rank 6) 
• Oh Sehun as Royal Consort Oh (Rank 7) 
• Do Kyungsoo as Lord of Regularity (Rank 5) 

Wu Yifan as Honorable Duke of Benevolence (Rank 4) 

Park Bogum as Noble Duke of Virtuosity (Rank 3) 

There are 8 ranks of the consort of the Empress* 

1. Imperial Duke ( The empress' official consort, only 1 allowed in the harem.) 

2. Grand Duke (Only 1 allowed in the harem.)

3. Noble Duke of [....] ( 2 allowed in the harem)

4. Honorable Duke of [....] ( 4 allowed in the harem)  

5. Lord of [....] ( 8 allowed in the harem) 

6. Honorable Lord ( unlimited number) 

7. Royal Consort ( unlimited number) 

8. Royal Concubine (unlimited number) 

* These ranks are not real. It is inspired from the chinese dynasty system and modified.