As A GAMER In One Piece - Chapter 46: CH-45 - TECHNOLOGICAL ASS OF A TURTLE!!!

This is a ‘rebirth’ story where Chen Rong, the heroine, finds her second chance at life after burning herself to death. Set in the Eastern Jin era when bureaucrats and their lofty yet equally hypocritical and oppressive ideas once ruled the empire, Chen Rong is made to use her past life’s experience to survive and hopefully find happiness this time around.

Master martial artists were beings that no one can obstruct. A martial arts expert has been reborn into the body of a genius whose cultivation has been abolished and has been abandoned by a woman. Therefore, he starts cultivating the art of Xing Yi Quan, producing a solar system within his dantian. His innate talent tramples over all the geniuses, and even the geniuses among geniuses.

His powerful spirit and ruthless and ambitious nature, no matter who he is reborn into, will never change! Slaughter is instinctive, being cold-blooded is his personality, exterminating an entire family is only a means towards a goal, cruelty means infamy, and chasing after women… is just an interest.

- Description from Novelupdates

In a world ruled by ten royal families, Saruto was born into the Lewin family (the Dark family). He grew up carrying a promise he made to himself with his mother's last breath: to become the pride of the Lewin family (the Dark family). He is compelled to acquire power to help him achieve his goal. In his quest for power, he begins to uncover the origin of the Dark Power that suddenly appeared in his world without warning. He realizes that his family's history is deeper than he thought. How will he discover his family's history, and will he be able to fulfill his promise to his mother to become the pride of the Lewin family (the Dark family)?

In his past lifetime, he was an exceptional prodigy who practiced both medicine and martial arts. In this lifetime, on earth, he used his superb medical expertise and extreme martial arts achievements from his past lifetime to excel in the medical field and the ancient martial arts world. He moved his way towards the pinnacle!