Suyi Xu

Height: 178cm
Weight: 63kg
Occupation: Mystery Novelist
Hobby: Writing

His real name is Xu Suyi (徐夙逸), but he doesn't like it, so he goes by Xu Su (虚宿), borrowing his friend's surname (it's the same pronunciation, but uses different Chinese characters).

An author that suffers from an unspecified mental illness which causes hallucinations. He also seems to have physical disabilities, and refers to himself as a "cripple".