Gwonwanghwansaeng

Dan Woosung, a man who once roamed the murim relying solely on his fists, met his sudden end at the hands of the demonic faction. He then finds himself in the body of the eldest son of an affluent merchant group named Eunha.
"I don't seek freedom from debts or grudges. Debts must be repaid. Grudges must be settled."
Though his new body offered only wealth, Dan Woosung rises again, backed with vast riches and the martial prowess of his previous life. Now, he returns to the path of vengeance.
(Source: Naver, translated)