Eun Ho is a gumiho, known in folklore as a mythical creature with 9 tails. She is different from other gumihos. She doesn't want to become a human unlike other gumihos. She enjoys her eternal youth that never changes. She picks out the fun parts in the human world and enjoys them herself. To avoid becoming a human, she refrains from small virtues and accumulating small bad deeds. One day, an unexpected incident takes place.
Kang Si Yeol is a world-class soccer player. He is the top striker for a famous soccer club overseas. As a soccer player, he accomplished many firsts and he shines brighter than the club itself. He is also the king of narcissism. His life is perfect, but, one day, Eun Ho appears in front him. His life suddenly changes.
