From A Stronghold NPC To The Final BOSS - Chapter 13

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

The constant mission is getting redemption.

Shuttle though various worlds to become a variety of scum men, do a little whitewashing and become a good man in the eyes of everyone.

Redeem those who are miserable, and let them live a happy life.

- Description from Novelupdates

William was but an ordinary man—until fate saw fit to thrust him fifteen years into the past. Yet, this was no mere journey through time; he awoke not in his own flesh, but in that of the third son of Duke Herne, the most formidable noble in the realm.Now, amidst the glittering halls of power, where smiles conceal daggers and honour is but a well-spoken lie, William must navigate a world where commoners are naught but dust beneath the boots of the aristocracy. In this treacherous game of deception and ambition, he must learn quickly—for in the world of the nobility, ignorance is a death sentence----------------------------Hear ye, my loyal readers… From this day onward, updates shall be limited to three chapters per day—no more!Alas, my quill grows weary, and my stockpile of chapters runs thin. The weight of silence presses upon this tale, and my passion falters…I ask but a simple boon—Golden Tickets and a flood of reviews! Shall this humble plea go unanswered?.

Liola—the best assassin in his world—has vowed to kill no more. He was being chased by an assassination organization when he accidentally dropped into a parallel universe: through a dimensional gate and into poor teenager Kaiser’s apartment. Instead of going to the government shelter for lost dimensional travelers, Liola and Kaiser wind up going to school together.

Liola has been trying his best to live the life of an ordinary person, but after certain things happen one after the other, he begins to realize that being an ordinary person could be harder than being an assassin.