Park Nina promised to herself she would never fall in love until the day she was old enough and ready. She and her grop mates meet the famout SHINee, catching the eye of two of their members. They show their affection toward her but she doesn't notice what they feel toward her. She also isn't allowed to show affection to boys for two reasons:

One; she promised herself she wouldn't open up to love until she was older, knew that he was the one, and knew what she was doing. She doesn't do the cute kid love like 'I like you one day and the next you've become forgotten.' She wants to be in a serious relationship.

Two; she along with her group mates have signed a contract saying they won't get intimate with a boy for at least 4 years. The contract was created to help keep the group's pure image and not to cause any scandal.

Will Nina ever return the affection or fall in love? Who will she choose? Will she keep the promise she made to herself?