The Apothecary Diaries 11 (Manga) by Natsu Hyuuga, Itsuki Nanao, Nekokurage

After breaking a “curse” on the imperial heirs, a palace servant with training in herbal medicine is promoted up the ranks to food taster...and right into the thick of palace intrigue in this lushly illustrated historical mystery series!

Having figured out the trick to navigating the corridors of the ancient mausoleum found within the Inner Court, Maomao does an admirable job solving the current mystery in front of the emperor and Jinshi. And then the Empress Dowager comes to Maomao, asking her to investigate the late Emperor’s curse. Jinshi’s past and parentage are revealed!