C202
If he didn't guess wrong, that person should be Gu Zhao. Ye Zichen didn't think that she would actually have Gu Zhao's contact information, so he underestimated her.
After looking through their chat history, Xu Xiao found that Jiang Yao didn't tell him her real identity, which meant that Gu Zhao didn't know that the person he was chatting with was Jiang Yao