A long time ago, a witch cursed the Byun family for despising and murdering same couples. 

When someone from the Byun family turns 17, he or she will turn into the opposite .

In order to break the curse, he will have to fall in love with a boy or if the byun is a girl, she will have to fall in love with a girl. The person whom he or she falls in love with must love them back.

If he or she fails to do so within a year, he or she will remain cursed for the rest of their lives.

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Byun Baekhyun, an orphan, who had just turned 17 had no idea about the curse and had woken up as a girl.

Lucky for him, his foster parents told him that they had found his grandfather but it was only a matter of time before he'd kick the bucket.

And luck must be on Baekyhun's side becuase Park Chanyeol A.K.A. Mr Popular has his eyes on him her.