While pursuing the secret of the mysterious jade, Maomao and Jinshi found more than just the tablet's owner—they've also discovered a forbidden book that has long lain hidden. As the book is gradually reconstructed, they discover that the knowledge and secrets within might be extremely important to someone very unexpected. Meanwhile, Maomao finds herself helping her father Luomen in what appears to be a large-scale drug trial...but what are they treating? And why?