"The male of the zhen bird is called Yunti, and the female is called Yinxie."
In his previous life, Chu Zhao died with an arrow through his heart for Zhu Xuanxu, only to be told he had been nothing but a pawn.
Reborn, he did everything he could to stay away from the princes' conflicts. He would no longer foolishly believe the sincerity someone claimed to feel for him.
He never expected that, despite all his precautions, that man's father would have him dragged into the silkworm chamber and castrated.
Chu Zhao swore he would never forgive Zhu Xuanxu. He would make him pay a hundredfold, a thousandfold, for the pain he'd suffered.
So he had someone create a poison called "Yinxie." The antidote was the blood from his heart.
The love interest is a real eunuch. Everyone is drawn to him. (Includes non-explicit domination and submission, no actual sex. Dark and unusual kinks, read with caution.)
Theme: Letting go of the past is the way to save yourself