An amnesiac business goddess enters a Substitute Marriage into a wealthy family, dismissed as a crude village girl. She gains the ability to hear her five-year-old autistic stepson's thoughts, which bring reversals: exposing business traps, smashing frame-ups, resolving kidnapping crises. Recovers memories, wins husband's affection and stepson's attachment. Regains identity as Summer, joins forces with husband to bring mastermind to justice.