MTL - My 1995 Small Farm - v2 Chapter 444 A must

Shao Xuan joins a friend in his expedition to a recently discovered archaeological cave. After he picks up an ordinary looking stone he is teleported to a different world and wakes up in the body of a small orphan child. The world he is in now is still in its stone age with primitive tools made of stone and the ways of the people are savage. Savage isn’t the only thing special about the people though, because they have superhuman strength, jump higher than trees and punch stones. In short, they are able to cultivate their bodies. Despite all this, it is a real struggle to survive because of the scarcity of food. Together with Caesar, his pet wolf, he tries to survive in this cruel world.

- Description from novelupdates

As the second daughter of Ningyuan Army General, Qin Wanru, who had been set up by her so-called mother and elder sister, lost her reputation and suffered a lot on her wedding in her previous life.

As a true over-bearing president scum gong, when Xie He for the Nth time rejected his admirer, he heard a sentence in his head: “Congratulations on achieving the “rejects 100 hosts” accomplishment; as an award you will soon bind to the “Scum Gong and Cheap Shou” system, entering other worlds to complete capture missions.

As a scum gong, Xie He expresses that it is very easy to hide one’s true colors, but…“I Heard My Boyfriend’s Brother Secretly Loves Me,” “Teacher Love Me One More Time,” “Raising Youth Manual,” “Your Majesty, This Servant Obeys,” “The Tyrant Lord’s Substitute Lover,” “Captive of the Empire,” “Disciple’s Cultivation Furnace”…

Xie He: Wait a minute. These words sound really strange… and why is my role the ‘cheap shou’?

System: Fighting poison with poison. Using scum to overcome scum. I’ll be relying on you to abuse the scum gong! Remember to not OOC~

Xie He: He he.

Later…

Xie He: Hm? You say all the scum gong love me? Sorry, I only love myself.

- Description from Novelupdates

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?