"Ah Xi." Xu Yixue was accustomed to this address. Ever since the regulation began, she had to be called "Ah Xi.","Hmm." Gu Xicheng put down the computer in his hand and looked at Xu Yixue walking towards him with a puzzled expression.,The other party nodded, then smiled mysteriously: "I didn't expect that in the investigation of Mu Weijun's disappearance that year, it was discovered that his wife and Xu's mother were best friends, and Mu Weijun and Gu Zhi were classmates."。