Here. Thanks to the comments. I recognized Song Seung Hun as Hsu Qi's character's boyfriend in So Close.

Here's the synopsis from a DVD retailer:

En See is a beautiful innocent girl, she has a farther (sic) and brother who love and care for her very much. But when she found out that she is not the actual daughter of the family, the live (sic) and love change.

So is the show any good?