Erica was appalled by her twin sister's request. Even though they look identical, pretending to be her sister for a summer is too much to ask! But there is a reason Emily, busy with her dissertation, is so desperate to stay away from her summer job. She is in love with her employer, Will. In the end, Emily convinces Erica, but when Erica meets Will, she's anxious about the switch. "How is it possible...for someone to be so gorgeous?" Erica must endure her throbbing heart as she starts her life as Emily!