In a palace rife with hidden currents, the rash but righteous Su Ran and the gentle, steadfast Huixin risk everything in the Library Pavilion as they try to expose Lord Zhou’s conspiracy. The cold-faced assassin Leng Yue suddenly appears to help them, but her motives are a mystery. As the three make their way to Lord Zhang’s residence, they are blocked by Xuanye, an old man in black robes. What secrets are they hiding? How will this struggle between justice and evil end?