College student Cheng Mo gains the ability to receive messages in her dreams. By chance, while helping psychiatrist Gu Qing search for her missing younger sister, she accidentally uncovers the truth about her own origins. It turns out that Cheng Mo carries the sealed soul of her twin sister, the Rakshasa Maiden. The two are a yin-yang pair, one righteous and one evil, each waxing as the other wanes. If the Rakshasa breaks through the seal and takes over Cheng Mo's body, she will open the gates to the underworld, bringing catastrophe to all living things. After a series of upheavals, Cheng Mo faces every challenge without fear, follows her heart, and begins fighting the forces of darkness.
