Send to and from Life

I don't know since when, Xiang Qingyu found that he couldn't seem to ask questions. As long as he had doubts about the existence of people or things around him, he would immediately change time and space, just like traveling through time. But there is always a girl beside me. No matter which time and space I am in, she is always there. Sometimes I don't know why she appears, sometimes I don't know her name, and sometimes I don't even know who she is. Who are you... I am, Shi... What?