Superstar From Age 0 - Chapter 485:

The notorious imperial court lackey and the meritorious military general were well-known for their mutual dislike, a pair of arch-enemies set in stone. Who could have foreseen the unexpected change in the winds of heaven: the general injured on the battlefield, both legs disabled, and even forced by the emperor to marry his nemesis.With one marriage edict, two people with mutual hostility are forced to marry and live under the same roof. Yet after these long days together, they come to the realization that this fellow is not truly devoid of any saving grace/unattainable and high out of reach.

This is the 40,000th year of the Empire's dominance over the Galaxy. The glory of the Great Expedition has long been buried in the dust of history. Su Yu has transmigrated here, opening his eyes to the ruins of a planet in front of him, utterly bewildered.On this planet, there are war machines that stretch for thousands of kilometers, now broken to the extreme, alien beasts whose roars can shatter mountains and rivers, and radiation alien beasts whose mere movement causes further destruction to the surrounding environment—There is everything here, except hope.Whether willingly or not, Su Yu struggled to survive for three years and finally inevitably contracted radiation sickness, seemingly about to become one of the despairing.Until his Profession Panel, capable of infinite job transfers, finally activated.“Ding!”“Detected that the host has met the prerequisites; do you want to take the profession of [Mechanic]?”“Completing this job will allow you to gain profession experience through daily maintenance, recovery, and assembly of mechanical creations, leveling up the profession, and with each upgrade, you receive an enhancement amplification of your physical attributes...”Looking at the pile of broken gun parts in his repair room, an unprecedented light lit up in Su Yu's eyes!Years later, at the core of the Empire, at the highest point of the Terra world, Su Yu, the Mechanic from Ruins Star, Ghost Shadow Blade of Dead Silence Wilderness, Initiator of the Giant God Soldier Project's Restart, Governor of the Shattered Star Region, Master of Mechanical Ascension, Supreme Throne of the Forging World, looked at the torrent of steel gathering below and commanded with a wave of his hand![Our goal is to make the (second) (crossed out) Empire great again!]

I gave them my everything.My time… my strength… my heart.I trained while they slept.I smiled when they laughed.I stayed… even when it hurt.And what did I get?Nothing.They looked at me like I was pathetic.Like, I didn’t belong.Like I was… less.But I... the naive person I am, continued trusting them.They told me to act like trash, fine—I became trash.They told me to act like a scumbag, fine—I played the role.However...One mistake, one single moment...That’s all it took.And they threw me away.But now…Someone else woke up in my body.A stranger, a man who doesn’t know the pain I suffered, but wears my face.Let’s see what he does with it.Because me?I’m done with this life, so to the soul who took over my body...This is your mess now…'Gray'.

The MC (Minato) is a college student who died in a plane crash and was reincarnated in a fantasy world. He was raised alone in the wilderness by his succubus mother, and now he tries to make his way as an adventurer.