Ha Yoon-seo has worked hard all her life: after raising her younger brother alone, she is now a marketing manager at a credit card company. Her life takes a dramatic turn when she discovers that her boyfriend, Seo Joo-won, is the heir to the family that owns the company. Upon discovering their relationship, Joo-won’s mother offers Yoon-seo money to break up with him, and Yoon-seo accepts. However, Joo Won is determined to win her back and will stop at nothing to win her heart back. Can Yeon Seo and Joo Won overcome the obstacles and find the ending to their fairy tale, or will reality tear them apart?