Kim Young-hoon (19)
-The next emperor of Z country
- The crown prince among three siblings. The eldest.
Kim Seon-woo (18)
- Crown Prince of Z and second oldest brother
- Not interested in politics
Lee Jae-hyun (19)
- Crown Prince of Country B
- The next emperor
- Man with unrequited love for princess
Lee Ju-yeon (17/21)
- From South Korea
- Count B, the main character
- Current prince and cousin
Kim Yeo-ju (17/21)
- From South Korea
- The youngest princess of Country Z
- I hate Lee Jae-hyun