Mushoku Tensei - Volume 24 Chapter 2 — 34 Years Old

A great demon king who came from another world to conquer Earth. To save the Earth, Li Luyou could only first take care of this great demon king… a little girl proclaiming herself Her Imperial Princess.

- Description from Novelupdates

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

After transmigration, Lin Yue could hear a voice whispering in his ear every day, sharing all sorts of secrets with him.Small matters like the thoughts of the girl next door, to great mysteries like the secrets of the heavens, the voice persisted daily, broadcasting randomly.He originally wanted to live an unremarkable life, but in this world of Xianxia dynasties where mortals are considered as insignificant as weeds, the fate of an ordinary man without power is no longer in his own hands.Thus, he had no choice but to stop being 'just a person'.'Your Majesty the Empress, you wouldn't want your secret of treason to be revealed by others, right?'

Callius von Jervain.

A character who dies no matter what he does. A character who falls into a forced choice route where he can only die, no matter his choices up to that point. However, there is a single route where the character can live and play the game.

And I have to carve out that route somehow.

Because I’ve become Callius von Jervain in the game.