I'm the son of a concubine. No, even that makes me sound more legitimate than I am. I'm just a bargaining chip my mother secretly gave birth to, hoping to squeeze more estates and land deeds out of that heartless man when I grew up.
Fortunately, I have what it takes. I'm ambitious and capable. I'll take all of his property and seize all his power. And my dear older sister, you should be mine too.
Theme: Strive upward and be self-reliant.