In the thirteenth year of Tianbao (AD 754), Chang'an City seemed to be singing and dancing peacefully, but in reality there was an undercurrent. The shadow of the Anshi Rebellion quietly loomed over the country. The powerful minister Li Linfu and Yang Guozhong fought openly and secretly, and the border governor An Lushan was busy with his troops. At this time, a bizarre case broke the calm - Hu Shang from West City died suddenly in a secret room, and paw prints of a suspected "iron-eating beast" (giant panda) appeared next to his body. Su Wuming (a prototype of a famous official from the Tang Dynasty) who was demoted to Dali Temple as a judge, and Yuchi Qiniang (the daughter of Hu Shang from the Western Regions) who is good at "ventriloquism" teamed up to investigate the case. They uncovered layers of conspiracies while laughing and scolding, and finally revealed a shocking secret related to the fate of the country.
