Five years ago, Grace Cross was given away to Jack Hale as compensation after her younger sister Wendy called off the engagement. When Wendy returned to the country five years later, Jack sided with her at every turn. It was then that Grace realized that her five years of devotion had never once touched Jack’s heart. Heartbroken, she took the initiative to propose a "swap"—she and her sister would trade places. And it was only after losing her that Jack realized: she had already taken his heart long ago.