Seo Ah Yeon is a nine tailed fox. Byun Baekhyun is a human. Long ago, Ah Yeon met Baekhyun when he was a child. She saved him from drowning and started to get attached to him. She promised him that she'll protect him. But Baekhyun had to leave and move to a different country. Now to this day, Ah Yeon still remembers him. But what if they met again? Will he be able to remember her? Will they be together?