Time Travel: My System Is Not Working Properly

Xu Sansheng accidentally traveled to an era where monsters were rampant and was chosen by a strange thing. It claims that this era needs to be corrected and some things that do not belong to this era need to be recycled. Forcing Xu Sansheng to kill people he didn't want to kill and do things he didn't want to do. Many years later, when Xu Sansheng looked back again, it was difficult to judge right from wrong.