The Main Concubine Accepts the Favor: the Side Concubine Gets Out of the Way

I have known since I was a child that I would marry into the royal family. But when I found out that the person I was betrothed to was the second prince, Prince Rui, I frowned. Because everyone in Kyoto knew that there was only one concubine in his house who was dear to his heart, and he had been doting on her for many years. It doesn't matter, I want to be the royal concubine, so I naturally have this magnanimity. But since I was little, I have always strived to be first in everything, so naturally the first place in my husband's heart must be me.