Hyeonsu, a nine-tailed fox (Gumiho), must collect the romantic feelings of women in 1,000 fox vessels to finally become human. Just as he was about to fill the very last vessel, a Joseon-era woman named Ihwa died while still holding it. Following Ihwa's death, Hyeonsu felt deeply betrayed by the nature of human love, and centuries pass without him ever achieving his goal. In the year 2025, Hyeonsu unexpectedly crosses paths with a woman named Baek Ha-jin. Upon realizing that Ha-jin is the reincarnation of Ihwa and still carries the vessel within her, he resolves to capture her heart this time to complete his transformation into a human.