Drama also known as The Lost Heir's Wedding Day | I Became a Millionaire on My Wedding Day | The Hidden Heir; On his wedding day, a man discovers that his fiancée has been deceiving him and is pregnant with another man’s child. Someone from their childhood, holding a grudge, used his girlfriend to set him up. Just as he faces humiliation from them both, the heiress of a super-wealthy family arrives. He finds out he is actually the long-lost heir of this family, and his sister has come to give him the grand wedding he deserves!