One Piece : Roger Is My Vice Captain - Chapter 378 - 437—Be a pig for once!

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

As the heir apparent of the Ye family, Ye Xuan went through fire and water for his family, but Ye Lang, who had just awakened his Divine Soul, usurped his place. In order to keep his position, Ye Xuan challenged Ye Lang to a Life-death Duel. With a broken Dantian, would he be able to win this fight?

Being a bottom feeder in society is an unpleasant experience.That's how Kiro felt after being left for dead in a back alley. Abandoned and disappointed by the 'work hard' ethic his parents left for him.'At least the heavens are weeping for me.' As the light from his eyes faded, he declared as the last act of defiance.He awoke in a room he hadn't seen in ten years. Whether it was due to sheer luck or divine intervention, he was grateful.'Through the VR game, Asgard, I'll become filthy rich in this life time.'Kiro was blissfully unaware that his return was a cry for something greater, for the underlying threats that hovered over his world.

Entering Tokyo in the bubble era, in this strange era, the only familiar ones are Matsuda Seiko, Nakamori Akina, Kudo Shizuka…

- Description from novelbuddy