My Dear Sister, You Are My Brother's Reason for Living.

[No CP+main family affection+group pet+domei+slightly cruel knife] The tenth princess of the Sheng Kingdom, she is the emperor's most beloved but most feared daughter. He is the most beloved and important person to Prince Nangong Yi. He is the person that Prince Nangong Yi cannot lose, and he is also the motivation and reason for Prince Nangong Yi to live. It's the first nine royal brothers The youngest sister who is most feared by the nine royal sisters. Brother and sister break up "Imperial sister, who do you think the emperor is in your heart? Or is he just a dog that comes and goes when called? Nangong Lingxin, let me ask you, I, Nangong Yi, have done so much for you and given so much. What do I mean to you in the end?" Nangong Yi grabbed Nangong Lingxin's wrist with such force that it seemed like he was going to break Nangong Lingxin's wrist. "Emperor sister." Nangong Yi stared at Nangong Lingxin with scarlet eyes, stubbornly wanting an answer, even if the answer would make him lose the motivation to live and the reason to live. Nangong Lingxin's eyes were indifferent and calm as she looked up at Nangong Yi in front of her, his scarlet eyes trembling, asking her what he, Nangong Yi, meant to her, Nangong Lingxin. Nangong Lingxin didn't answer him but just looked at him silently. Nangong Yi looked at Nangong Lingxin looking at her like this. At this moment, he closed his eyes in despair and tears fell silently from the corners of his eyes, "How ridiculous! He Nangong Yi is a joke, a big joke! Hahahaha..." Nangong Yi collapsed in despair, cried and laughed like a madman, covering his chest and laughing to the sky. [The heroine and the tenth princess are called "Nangong Lingxin". Please note that there is no CP in this article]