How To Survive as a Villain - Chapter 8: You Can’t Walk Through The Main Door.

[WSA 2025] To confront the threat posed by monsters and demons, humanity summons a hero endowed with a mysterious system and an unrivaled capacity for evolution. He becomes the last bastion of hope for mankind. However, one of his mistakes gives rise to a calamity far worse than the Demon King.This calamity is conceived in a dungeon, abandoned as a fetus by its mother, and raised by the Demon King himself. Upon the Demon King's death, all the restraints he had placed upon the creature are shattered. Thus, the hero's nameless son begins to lay waste to everything. The greatest calamity the world has ever known is born.

[Infinite Regression Genre] In any fantasy novel, regression is a guaranteed cheat key!What if it’s the ability of [Infinite Regression]?There’d be no need to worry about any bad endings. After all, the protagonist would eventually reach a happy ending.“Cheat key, my foot.”I tried it myself just to find out otherwise.The myths of regressors’ success depicted in all those novels are actually fake…It was all just vile propaganda!“This run is doomed too.”This is not a story of success; it’s a tale on the aftermath of failures.Thus begins the heartfelt documentary of a man with 1183 runs of experience!Writer: UndertakerEditor: Oh Dok-seo

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates

Xia Yuqing is a shut-in+fujoshi from the 21st century. After an accident, she transmigrates into the body of a young princess forced into a political marriage to another country.