Born with a silver spoon in his mouth, Dae Woong dreams of becoming an action movie star. He goes to a temple to pursue this dream, where he releases a nine-tailed fox trapped in a painting for 500 years. Even though she has collected the life force of 100 men for youth and eternal life, the nine-tailed fox does not intend to steal Dae Woong’s energy, yet ends up losing her orb to him due to an accident. To reclaim it, she sticks close by, learning that if Dae Woong bears the orb inside for 100 days, she can become a human being. With her life in peril and sweet strife while living together, can the nine-tailed fox actually become human?