The God of Sky & Earth - Chapter 1134:

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

Ahn Seung-hyun, a college student who lived hiding his identity as a gay man. While on his way to meet an acquaintance he met through a gay dating app, he discovers that the acquaintance is a college classmate trying to out him.He tries to run away but gets into a traffic accident. Just when he thought he had died, he finds himself possessing ‘Han Seung-hyun’, the villainous character from the novel he was reading, and continues living that life.However, there’s a problem: ‘Han Seung-hyun’ is someone who has been given a life sentence with a time limit.Feeling wronged for a moment, Seung-hyun thinks, ‘Since I’m dead anyway, can’t I fulfill my dream of being a rich unemployed person for a little while?’ and resolves to do everything he wanted to do with his remaining life.Can’t he have s*x at least once before he dies? With that thought, Seung-hyun boldly goes to a gay bar to find a one-night stand partner, but ends up getting involved with the one person he absolutely shouldn’t have.“Ju-, Ju-, Ju Jae-young-ssi.”“Yes. I am Ju Jae-young.”What will happen to Seung-hyun’s terminal life after spending a night with Ju Jae-young, the sub-male lead in the novel who dislikes Seung-hyun?

After experiencing heartbreak from being abandoned, he enlisted in the military.

And then, he became a war hero.

She was a peerless genius in the 24th Century – all she needed was a silver needle and she could practically bring anyone back from the dead.