Ruin Wielder - Chapter 19: Luo Mansion.

Xie Jin is an international student studying in the United States. Because of an accident, he obtained a special ability that allows him to detect the attributes of all objects within a certain range. Because of this ability, he started from panning for gold and gradually went to the country of Bald Eagle. The pinnacle of wealth. (No abuse, no depression, logical, straightforward and reasonable road to the rise of North American chaebols)

- Description from novelbuddy

I died a heroic, powerful, male Archmage… so why did I wake up as a sixteen-year-old girl?!Theo’s last memory is of a glorious, failed last stand. His next is a beeping hospital machine—and a terrifyingly handsome guy he’s pretty sure is a demon calling him “princess.”Now, he’s Thea Montrose, youngest daughter of a powerful family in a world run on magi-tech and corporate espionage. Between navigating floating cars, enduring his new mom’s hugs, and figuring out the horrifyingly complex mechanics of using the bathroom, Theo has his hands full.But his new family is hiding secrets, and their rivals play for keeps. Good thing this spoiled heiress’s body now holds the soul of an ancient wizard. They wanted the real Thea back? They’re about to get way more than they bargained for.He failed to save his old world from an apocalypse—now he just might save this one (and finally figure out how this bra works).

With divine medical skills in his left hand and supreme martial arts in his right, carrying a century of memories, he was reborn and returned to the city. This life, he vowed to dominate everything, take control of all, and ascend to the zenith of the heavens!

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?