Rebirth at the Doomsday: Upgrading·love·fighting Zombies

In my previous life, I unfortunately crashed and died as soon as I was admitted to the teaching staff; in this life, I hold the system in my hands and was reborn as my three-year-old self. I know the future well and take advantage of it. In the end of the world, I can move forward for myself, my family, my friends, and my lover, and survive in the fire... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.