Winnie Hart, a world-renowned jewelry designer, returns home after an extended stay abroad. She keeps her identity hidden, not realizing it will soon collide with that of Luke Smith, heir to Smith Corp. Her meddling inadvertently ruins his date, but Winnie remains oblivious. To make amends and find the "Heart of the Lost," a treasure from her family's past, Winnie proposes marriage to Luke. They agree to tie the knot, unaware that they're hiding their true selves from each other as they begin life together under one roof.