MTL - American Entertainment 1982 - Chapter 20 advise him

[You have entered the dungeon at Gwachun Station’s 1st Exit.] When former high school student Kang Woojin finds himself returned back to Earth after being forcibly summoned to a foreign planet for 20 years, he soon finds that Earth is not the same, normal place as he once remembered it to be.

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?

- Description from novelbuddy

“How the hell is this possible?”Dead and betrayed in the snow with the rest of his squadron, Mikhail is surprised to find himself regressed in time.What's worse was that he had no idea how or why he regressed as his memories at the time of death were completely gone.With his element of Oath -the power to make vows in exchange for power- also now messed up, Squadron Leader Mikhail Hendrix must now navigate through this changed storyline with no clues at his disposal.He needs to try his best to keep his squadron alive in this dangerous world of gods and magic, all the while figuring about his regression and the woman.

What if your own father and his mistress were behind your mother’s death? What if you were about to be sold if to a scumbag?