One Piece: Capitalist Brook's Crew Expansion Plan - Chapter 139: One Strike

Qin Tian accidentally transmigrated into a sickly body, a body with broken Dantian that was unable to practice Qigong, in another world. Fortunately, God had mercy on him by giving him a level up system. Useless? That was him in the past. Not worrying about practicing Qigong, he was now able to kill Monsters to level up. Easy! Level up when killing Monsters; level up when killing people. An unbeatable sovereign of the clan in the eyes of other people, but in his eyes, he is a glittering big BOSS.

With this level up system, he will no longer encounter any bottlenecks during a breakthrough in cultivation like other geniuses; all he needs to do was kill as many monsters, clan heads, sovereigns, world experts … to have a better life.

Dedicating his life on a road to become an expert.

- Description from Novelupdates

Hoarding top-tier baddies, stealing people's wives, and cucking kings and emperors. That was Dapper’s daily routine. Life was sweet… until he caught the attention of the system enforcers.Liam, a teenage thief with a twisted way of thinking, died in the middle of a high-stakes heist. But just when he thought it was all over, he met a god, a failed god, who granted him a glitched system.Reincarnated into the body of a meek teenager named Dapper, Liam finds himself in a world ruled by magic, systems, and mythical creatures. This time, he’s determined to live the life he never could in his old one. The wild fantasies he once harbored are finally within reach… but at what cost?

Xin Yun, a sarcastic young man, traveled to an unknown world by chance, but lost his chance to become the strongest because of his obsession with women... or sex. In a collision of the powers of nine powerful men, an incredible thing happened. Xin Yun was reborn back to the time when he traveled to the Isekai world. A fantasy journey is about to begin... [The comic adapted from this novel is popular all over the world]