Reincarnation of the Fist King is an action-packed Manga/Manhwa/Manhua available in English. You can read the translated chapters on the fastest updating comic site.

Summary:

Dan Woosung, a skilled fighter in the murim, meets an untimely death at the hands of a demonic faction. However, he awakens in the body of Eunha, the eldest son of a wealthy merchant family. “I don’t seek freedom from debts or grudges. Debts must be repaid. Grudges must be settled.” Although his new life offers him riches, Dan Woosung is determined to rise again, combining his newfound wealth with the martial skills from his past. Now, he embarks on a quest for vengeance.