Jiuqu Tianji: Chang'an Key

In the fourteenth year of Zhenguan (AD 640), under the rule of Emperor Taizong of the Tang Dynasty, the country was strong, the population of Chang'an City exceeded one million, and the prosperity of Hu and Han Dynasties blended together. Taking the 108 squares of Chang'an City as a chessboard, it focuses on the characteristic areas such as the gathering of Hu merchants in the West City, the gathering of officials in the East City, the peaceful singing and dancing in Pingkangfang, and the numerous hotels in Chongrenfang. The protagonist uses modern chemistry knowledge (such as distillation to extract toxins), criminal investigation concepts (such as on-site protection awareness), logical reasoning ability, and combined with the existing technology of the Tang Dynasty (silver needle poison test, autopsy) to solve the case.