I recommend "The Legend of the Immortal God", an oriental fantasy novel. The parents of the main character, Wang Jie, were the children of opposing families. Their relationship was not recognized by the two families, and Wang Jie was not allowed by them. He had obtained the undying heart in primal chaos continent and ascended step by step to become a Paragon. In the end, he had become a Deity. This book meets your requirements. The protagonist is born in the immortal world or ascends from the beginning. I hope you like this fairy's recommendation. Muah ~😗