Back in High School, My Husband and I Have Never Been in Contact with Each Other.

Rebirth, Campus Literature

I have read a book before. The female protagonist is called Xiao Shuang. She suffers from a disease similar to depression and low self-esteem. The male protagonist guides her out of the state of mental illness bit by bit. Later in the novel, the virus at the wall and the medicine for immortality are mentioned. Can anyone help me find it?