During this period, Zhao Yao was not at the Han Prince Mansion, but stayed in the North Mountain of the Swamp Prefecture.
The geographical location of the North Mountain is special, with a natural barrier, making it the most suitable place for "unseeable" experiments. Before the Lantern Festival, Zhao Yao continuously blasted the Alchemy Furnace and finally succeeded in concocting the Black Fire. Now, he is working on the Black Fire in the laboratory inside the North Mountain Cave.
A few days ago, due to the death of the deposed Crown Prince's family, Zhao Yao did not come to the North Mountain to conduct Black Fire experiments. These days, Zhao Yao completely forgot about the tragic death of the deposed Crown Prince's family and focused entirely on creating Black Fire Weapons.
Zheng Cheng followed Zhao Yao to the North Mountain Cave, while the matter of building the Water Wheel was left to the people below.
