What is the motive?

"Mmm, smells so good, looks like it would taste great too." Su Yurou took the soup with a face full of blissful smiles.

"Hehe!" Leng Xuan laughed briefly, looking at Su Yurou's happy expression, he felt very content and said, "Yurou, take your time drinking it."

Su Yurou nodded, took a sip, and then said, "It tastes really good, hehe, Brother Leng Xuan, why are you so nice to Yurou?"

Leng Xuan was stunned for a moment, then smiled and stroked Su Yurou's hair, saying, "Silly Yurou, you already call me Brother Leng Xuan, as a brother, how can I not be good to my sister?"

"Is that so?" Su Yurou felt a twinge of sadness in her heart, and thought to herself, 'Brother Leng Xuan, Yurou wants more than just a brother!' However, she felt too embarrassed to say that out loud.

Leng Xuan smiled and said nothing more. When Su Yurou had almost finished her soup, he asked, "Yurou, do you have any grudges with Gao Xu?"