The Autistic Heiress's Substitute BrideEpisode 4

After being taken back by the Howard family, true heiress Mia is tricked by their fake poverty scheme and forced to marry the autistic heir Elena in place of their adopted daughter Iris. After marriage, she discovers Elena is not feeble-minded at all, but a powerful group heir hiding his true strength. Amid wealthy family conspiracies, the two save and heal each other. Mia awakens to self-worth beyond family affection, while Elena drops his disguise and swears eternal protection to her.