In a modern city lies a hidden supernatural world unknown to the public. Li Yan, a rugged detective, solves one bizarre case after another with his uncanny instincts and unconventional methods. Su Qing, an occult girl with the ability to interpret the forces of yin and yang, has her fate entwined with Li Yan's after an accident. As they uncover the truth behind urban legends and paranormal events, they gradually reveal each other's pasts and secrets.
