Shadow’s Resurgence is a Manga/Manhwa/Manhua in english language, manhua series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Sal Cooper, the most loyal and efficient shadow of the family, was sent out as a sacrificial pawn by the newly appointed head of the Cooper family during the major distribution meetings after representing the family in victorious battles. He became the object of abuse by the former subordinates who once served under him. After exerting all his efforts to kill those who had humiliated him and attempting to take Alan down with him, he discovered that as a child, he was chosen by the family to be the “shadow” and was enchanted with magic, unable to harm Alan and instead bearing all the injuries Alan suffered, thereby enhancing Alan’s own abilities. Learning from Alan that his entire life as a shadow was orchestrated, Sal reversed the magic’s effects and, through his own death, reclaimed everything Alan had taken from him, including talents and abilities. Although Alan survived, he lost his vitality and the ability to intimidate other families, leading to the downfall of the Cooper family. However, Sal Cooper was reborn at the age of three, before the magic of “nourishment” was cast upon him.