Rebirth System: the Waste Host Was Taken Away by Me

I died, but was reborn as a system in someone else's mind. The host is a waste, and it's only through me that I can barely survive until now. Since you are so useless, don't blame me for being a guest. From today on, the system is me and the host is me too I will take your body and take everything away from them, Trample all the geniuses into experience points.