He is a fox who has no youth since he was born. He lives in a cave with his mysterious mother and dashing sister. He has been repairing for many years. He witnessed his mother's hard work and his sister's escape... His fate was destined to be intertwined with that "butterfly". Perhaps, from the moment they met, the noble thousand-year wings would rest for love. It was this stubborn butterfly that lifted up his fox fur and revealed the secret that had been hidden for thousands of years...