MTL - Super Security in the City - Chapter 4443 war

I have clairvoyance, and I can see antique treasures no matter where they are hidden. Is there anything else in the world that I can’t go to?

- Description from novelbuddy

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

Xu Xiang is a doomsday survivor who survived for forty years. Before she could fulfill her dream of becoming the overlord, she died.Opening her eyes, she returned to the fifteen years before the doomsday began. With the help of her family heirloom the dragon and phoenix ring, she hoards supplies and prepares to welcome the doomsday.Unfortunately, she was betrayed by her own family and died the night before the doomsday begins. With hatred in her heart, she swallowed the dragon and phoenix ring and jumped off the cliff.When she opened her eyes again, she was still alive, but arrived in a world that was plagued by endless wars and constant natural disasters. Although she's lucky enough to get another chance, she's unknowingly drawn into political turmoil where someone may be killed without knowing who the killer is.Can she survive in this ancient world that is more dangerous and full of hidden dangers than her own? Can she find the courage to trust someone else again? After two lifetimes, can she find her own happiness?

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?