KD's Third Book

[Apocalypse + Zombies + System + Power Fantasy + Multiple Heroines + No Saintly Heroics + No Dropped Story + Underground City + Cautious Early Game, Invincible Late Game]

The male lead is reborn 24 hours before the apocalypse begins. In his previous life, his girlfriend betrayed him, and monsters devoured him.

Now that he has another chance at life, he intends to repay every hurt he suffered in his previous life, many times over.

Because of a difference in System versions, the male lead activates his System ahead of time. By completing the System’s missions, he can earn all kinds of rare items and powerful equipment.

With the System’s help, the male lead eventually rises to power and leads humanity in rebuilding civilization.