Jessica has the young sister, who named Krystal. They have sister bond that really great, and everyone who is seeing it would be envy of their sister's relationship.

But someday, Krystal is nagged by their parents to marry someone who has business related with their family. Although Jessica is the older, but she has girlfriend that their parents really know and blessing, that's why their parents chose Krystal and didn't bother Jessica's relationship. Unfortunately, Krystal is refusing this plan, because she is too young to married. How hard she refuses but still her parents didn't bother about it.

Until a crazy thing popped in Krystal mind. She asked her sister to pretend as her and meet someone, who has to be her date and marry with.

And this is the story begin.

The main cast:

Jessica Jung

Im Yoona

Krystal Jung