The Overlord of Blood and Iron (WN) - Chapter 294

Lu Zheng possessed a jade seal which allowed him to transmigrate to an alternate world freely.Initially, he thought that the alternate world which he frequented was but an ordinary ancient civilization. With no particular ambition in mind, he planned to become a merchant and enjoyed the casual life of a rich man. He would find a few pretty maidens to accompany him while he explored the place and enjoyed various delicacies. That would be his ordinary and mundane life.His boring life lasted until the day he gave a beggar who showed up at his doorstep a meal. His jade seal obtained a strand of luck because of his action.Since then, he encountered a fox demon visiting him during the day and a beautiful ghost looking for him at night.The members of the Quanzhen Sect paid him tribute while some Buddhist monks stood in his path.So, it turned out that this world was not ordinary.

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

After his fall, the Duke who was distant with his wife and daughter recalled his memories of another world. With a new perspective on life, he swore to cherish and protect those two.