So-yool, driven by revenge for her family's demise, infiltrates the royal palace and attempts to assassinate the king. In a twist of fate, she encounters Ha-joon, who embodies the spirit of Prince Yeon-hwa. Chaos ensues, and So-yool suffers a head injury, leading to amnesia. The king, unaware of her true intentions, offers her a place as Prince Yeon-hwa's concubine. This unexpected turn of events throws So-yool's plans into disarray.