The End of the World: Start with a Cool School Beauty

[Apocalypse + Rebirth + Not the Holy Mother + System] [This book is not a mindless read, but has a moderate pace. Zhang Wei returned to before the apocalypse broke out, and the corpse poison serum was delivered as soon as the system was activated. (What? You have a fifth-order crystal core! Sorry, I have a gene potion sent by the system.) (The shrewd young woman also becomes obedient in front of him) (The aloof school beauty shows her fiery love in this life...) After returning to this life, he quickly stood up with his own experience and system, but as he became stronger and stronger, some inaccessible things began to surface...