Former General Is Undead Knight - Volume 1, Chapter 24: Lord of Underground Labyrinth?

The story is about a boy entering high school, who answers a strange call from a public phone one night. The caller challenges him to a bet: She’ll remove the birthmark which he sees as the cause of so many problems, and he’ll have fifty days to win the heart of a girl he’d considered far beyond his reach. And with this, a very strange summer begins.

Have you ever thought that the state of the world as it presently is, could revert to the laws of the ancients? When a series of strange incidents beginning with the disappearance of his friend led Luo Yuan to question the possibility of an apocalypse, he becomes embroiled in the midst of a global-scale chaos.

Evolution has turned the flora and fauna of the vast and bountiful Earth into something that had never been seen before. Coincidentally, the all-dominating Homo sapiens have ended up at the bottom of the food chain. From mystery to crisis, will Luo Yuan discover a means of saving humanity by racing to the top of the food chain? Or will he strive in accordance with the law of the jungle? It is the dawn of an age of the survival of the fittest.

- Description from Novelupdates

She gets drunk in the bar and accidentally offends her husband whom she has rarely met throughout their two-year-marriage! Rumor has it that Young Master Rong Yan is a germaphobe and will never let any woman get near him. Why is she an exception? Rumor has it that Young Master Rong Yan is ill-tempered and whoever offends him, would be sent to meet Hades. But why is she still in one piece after provoking him? She would definitely make those who bully her and treat her unfairly, pay the consequences for their actions!

Ruins stretched across the landscape in the apocalypse after the nuclear war.