Dark and Light Martial Emperor is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here.
Yeon Hojeong, the first to unite the dark factions as the leader of the Unorthodox Faction, collaborates with the Orthodox Faction to overcome the chaos of the Three Cults. However, he meets an untimely end, entangled in the schemes of the Murim Alliance Leader. “This really is my home!” When he opens his eyes, he finds himself in the prestigious and once-destroyed Yeon Clan, a place he never forgot. “I won’t make a mistake this time. Neveragain.” Determined to prevent the fall of his family and the future upheaval caused by the Three Cults, he embarks on a relentless journey! This is the struggle of Yeon Hojeong, the eldest son, to unite the martial world.