[No system + no powers + no harem + no zombies + doomsday + group portraits + not a cool article + don't enter if you mind]
In the 80th year of the end of the world, human beings are living in underground cities...
There is a pair of brothers and sisters among them, or they may be siblings...
His name is Chen Pingan, her name is Ji Qinghan...
He talks more, she talks less...
He has no abilities, but her strength is amazing...
He treats her as his sister and she treats him as his brother...
