Review Detail of pretzel005 in Strongest Weakling

For 3 chapters, it piqued my interest a bit. I am fond of an MC gaining a system and going back in time, so I'm biased on that. The writing is understandable but needs to be polished. The fight scenes are a bit dull I guess, I need details. That last chapter though, I'm worried on his sister, is he going to fight that person who recently appeared?