Why does Meng Xueyuan Vuk Nana have dark genes?

Because Vuk Nana's father was a dark race, he fell in love with Vuk Nana's mother, Ken Scarlett, and stole the hard stone of the moon with Scarlett to show his sincerity, but Ken Bienghi didn't agree with them. Vuk Nana's parents eloped to the earth. Although Uknana and Urals are sisters, one princess, Virginia, inherited the quark gene and became a quark family, while the other princess inherited the dark gene but became the star of the moon. In order to keep this secret, Bean lied that Vuk Nana was Princess Naya and sent Vuk Nana to see Meng Xueyuan. Finally, she found that Ural was Princess Nya, and Ken Ji lied that she said that Princess Nya in Vuk Nana was to protect the real Princess Nya.