They are Brother and Sister

"Li Feiyun?" Xia Xibei's eyes flashed, pretending to be puzzled as she asked, "You know him? And why does this name sound a bit familiar..."

She cocked her head for a moment before coming to a sudden realization. 

"Li Feiyun, Li Weiyun… Are they older brother and sister or older sister and brother?"

Seeing that she guessed it, Qiao Yanjue didn't hide it from her.

"The two are older brother and sister."

He took out his phone, flipped through his photo gallery for a while, found a photo, enlarged it, and placed it in front of Xia Xibei. 

"Is this him?"

The screen showed a family portrait with more than a dozen people, both young and old, all of them looking quite elegant.

Xia Xibei pointed to a man in the photo and nodded, "Yes, that's him!"

"It's really him!" Qiao Yanjue frowned. "Isn't he in the imperial capital? Why did he come here? How do you know him?"