Karma for the Ungrateful / Siblings' Awakening

As a child, Andy Grey, the young master of the Elite Group, was separated from his family and adopted by a peasant woman. He was beaten into mental disability while protecting his adoptive sister. Years later, Andy and his adoptive mother attended his sister's wedding, only to be humiliated and rejected by the ungrateful sister who refused to acknowledge them. Unbeknownst to her, the wealthy playboy she was trying to marry turned out to be Andy's biological younger brother—leading to her ultimate humiliation and comeuppance.