This is really not mechanical ascension - Chapter 98 - 81: Great Harvest, Abundance Overflowing_2

The world has turned into a hell, a place where the strong thrive!

30-year-old Jo Minjoon has always wanted to become a chef. He started his culinary career late in life, however, and is currently chopping onions at a restaurant. Regretting his life choices, he wishes he could go back to change it all and falls asleep. Meanwhile, someone out there is willing to give him another chance and send him back in time. How will he use the new powers he obtained from this mysterious being?

Freshman student Yang Dingtian possesses the Nine Yang Body, found only 1 in million. His Yang Fire is incomparably vigorous and thus, he cannot be near a female’s charms for his entire life. On the night of his 19th birthday, he decided to bid farewell to his virgin life. After stealing and tasting the forbidden fruit, he spontaneously combusted as the result!

In death he crossed over to another world; a world that held respect for Martial Power. His, originally, catastrophic Nine Yang Body was the Nine Yang Body that couldn’t be seen in a millennium! He was saved by a mysterious old man when he was at his last moments and the old man received him for a disciple, then betrothed his daughter to him. Thus, in this odd way, Yang Dingtian became the successor of the largest clan under Heaven, and became the number-one-beauty-under-heaven’s fiance.

- Description from Novelupdates

“Shit, why this guy!?”Of all the unique characters he could’ve transmigrated as, it had to be the bastard instructor.Vanitas Astrea.A third-rate middle game boss, who was dismissed from the University after severe allegations, losing his teaching profession and ultimately, exiled from the Empire.“.....How did I even get here!?”Vanitas must now circumvent his way around this new world, confront his past, mend broken relationships, and prevent looming tragedies that would lead to his demise.