We Know Our Mistakes, Dear Elder Brother

Joseph, the heir to the Prosperous Group, was separated from his family as a child and adopted by a kind-hearted farmer. In order to protect his adoptive sister, he was beaten into a fool. Years later, Joseph and his adoptive mother attend his sister's wedding, only to be humiliated and coldly rejected by the ungrateful sister, who refuses to acknowledge them. What she doesn't know is that the fiancé she's so eager to marry is none other than Joseph's biological brother—and in the end, she gets a rude awakening.