One Piece: I'm Destined to Be the Son-in-Law King! - Chapter 4: Even Working Requires Striving

This is a story of a modern man returning to ancient times, returning to a real world without any extraordinaryness, and slowly rising by relying on the ability to attribute all data.

- Description from novelbuddy

Li Guanqi was only six when he killed his abusive uncle to save his mother. Moved by the tragedies that had befallen the tiny child, an old man named Su Xuan adopted Li Guanqi. Eight years later, he left the village and told Li Guanqi to join the Daxia Sword Sect — while it may not be the richest sect, it was virtuous. Then, he gave Li Guanqi a sword coffin and made him promise 2 things: that he would always carry it on his back, and to only tell people it was an ordinary sword box.Will he be able to uncover the mysteries of his sword coffin? Why was there a spirit trapped inside it? Who exactly was his grandfather?His sister was worked to death, his mother was seriously ill, and his gambling-addicted uncle even set his sights on the money meant for his sister’s funeral. Li Guanqi, wielding a knife, killed the man, until he encountered an old man named Su Xuan. Eight years later, the youth had become a swordbearer. Behind him was not a scabbard, but a sword coffin, the coffin for burying swords! From then on, this youth with ambitions as vast as the skies stepped into the blood-soaked world of cultivation!

A broken man who ended his own life finds himself reincarnated into the game he used to play. However, instead of becoming the protagonist or a powerful antagonist, fate places him in the role of a minor villain—a mere stepping stone for the protagonist in the game's first arc.