The Fourth Prince quickly reached out to cover his eyes. Practicing Evil Technique has its pros and cons. The pros are that his eyes have grown back, so he is no longer seen as a cripple in front of others. The cons are that he will eventually turn into a half-human, half-ghost form.
When he's calm, it's fine; his eyes are only a light pink color, like someone with conjunctivitis.
But if he gets angry, the situation becomes dire. Both eyes turn fiery red, looking like they're ablaze—that's truly terrifying.
Empress: "Imperial Son, your Empress Mother is asking you. What's wrong with your eyes?"
The Fourth Prince lowered his hand, speaking resentfully: "You've already seen it, haven't you? Your son can only be like this for the rest of his life. Ultimately, it's all that wretch Situtu Xueer's fault, turning your son into neither ghost nor man."
