Super God, Undead System!

Chen Ansheng is just an incompetent reincarnated postdoc who has come to an era of powerless upgrades. His sister is extremely talented. As an older brother, of course he has to support her in school, but who would have thought that he would die because of 500 gold coins? However, things are going well. He accidentally obtained the Super God Undead System. Let's see how he can change his destiny against the will of heaven!