To Ji-han, the sole heir of three generations of the highly prestigious Choi family, Kim Seo-on was always a thorn in his eye. For an orphan who came in as an adopted son and lived as a dependent, he acted as the eldest son of the household, stole his father's affection, and now was even trying to take away his marriage prospects. In the end, Ji-han went to find a powerful shaman and asked him to cast a curse on Seo-on. The shaman gave him a clever plan: since the man had a destiny of excessive desire, Ji-han should use a sexual scheme. And so, one night when the household was away, Seo-on drank an aphrodisiac as part of Ji-han's plot and fell into a deep sleep. But in a moment of carelessness, Seo-on ended up opening his eyes… In the frozen dawn of February, a game of hide-and-seek with a beast begins.