B-Rank Adventurer With an Evil Look Becomes a Daddy to the Protagonist and His Childhood Friends is a Manga/Manhwa/Manhua in english language, Action 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

B-grade adventurer Grey was an NPC in the RPG “Bright Fantasy” … or he was supposed to be. He saves an orphan from an attack by a ruffian, and decides to raise the boy as his own. That orphan was Bright Fantasy’s protagonist, Isuka… His choice will greatly change the fate of the world.