THE MISSING HEIR

Here's the revised plot:

Lee Min-ho and Kim Go-eun, a wealthy and influential couple, are frantic with worry as their daughter, the heir to their fortune, goes missing after a tragic accident. Their son, Yoongi, is devastated and feels guilty for not being able to protect his sister.

As the family searches for answers, they are met with silence and uncertainty. The police investigation yields nothing, and the family's vast resources seem useless in finding their beloved daughter.

Years pass, and the family's hope begins to dwindle. But one day, they receive a tip that their daughter might be alive and living in the city. They are overjoyed and begin to search for her.

Just as they're about to give up, a young woman appears at their doorstep, claiming to be their long-lost daughter. The family is skeptical at first, but the woman's DNA test results and a distinctive birthmark on her back seem to confirm her identity.

Convinced that they have finally found their daughter, the family welcomes her into their home with open arms. They shower her with love and attention, and she quickly becomes a part of their lives.

But as time passes, Yoongi begins to notice small inconsistencies in the woman's behavior and story. He starts to suspect that something is not quite right, but his parents are too caught up in their joy to listen.

Is the woman truly their daughter, or is she an imposter seeking to claim the family's fortune and title? And what secrets is she hiding?