Review Detail of Rensarian in Counterattack System appeared when I'm already At The Mahayana Realm

This is actually pretty good. So far, nothing crazy has happened, but it's a pretty fun genre subversion novel. The main character's system is almost entirely useless to him, since he's basically invincible in his world already, but it's still interesting. If I had to give an alternate title to this novel (so far, after 47 chapters) I would call it "Don't Bully Strangers, It Might Be the Emperor In Disguise".