Joy of Life's capital was in Daqing City.

There was no clear information on the location of Joy of Life in the Qing Kingdom. The search results did not mention where Qing Kingdom's Jingdou was. Therefore, it was impossible to determine where the capital of Joy of Life was.
< Joy of Life >> The capital of Nanqing Kingdom was a city with the architectural features of the Tang and Song dynasties. The city tower buildings in the Qing Kingdom's capital had large dougong, with long and straight eaves. The roof had a gentle slope, and the overall feeling was grand and stable. It was in line with the simple structure, stable shape, and dignified and generous characteristics of the Tang Dynasty. Shangjing was the capital of Beiqi Kingdom. The scale of the city tower was relatively small. The eaves had a slight downward curve, and the eaves at the top of the ridge had a tendency to rise. The overall style was in line with the characteristics of Song Dynasty architecture. In addition, the gates of Jingdou and Shangjing were designed in the shape of a gnomon. This kind of door was more common during the Tang and Song Dynasties. Based on the above information, it could be inferred that the story of Joy of Life took place in the late Tang and early Song dynasties.
In Joy of Life, the capital of Qing Kingdom was Daqing City in Nanqing Kingdom and Qiqihar City in Beiqi Kingdom. However, these two dynasties were only a small area on Earth. The other places mentioned in the search results, such as Jingdou, Yichun, Haerbin, Mohe, and Vadivostok, had nothing to do with the Qing capital. Thus, based on the information provided, it was impossible to determine the exact location of the Qing Kingdom's capital.
The capital of Qing Kingdom was the capital city of Japan. The Qing Kingdom's Kyoto referred to the city of Kyoto in Japan. It was the capital of Japan from 794 to 1868 and was located in the center of the current Kyoto Prefecture. Thus, the Qing Kingdom's Jingdou referred to the Japanese city of Jingdou.
The capital of Qing Kingdom was the capital city of Japan. The Qing Kingdom's Kyoto referred to the city of Kyoto in Japan. It was the capital of Japan from 794 to 1868 and was located in the center of the current Kyoto Prefecture. Thus, the Qing Kingdom's Jingdou referred to the Japanese city of Jingdou.
The capital of Qing Kingdom was the capital city of Japan. Heian was the capital of Japan from 794 to 1868. It was located in the center of Kyoto Prefecture. Thus, the Qing Kingdom's Jingdou referred to the Japanese city of Jingdou.
The capital of the Qing Kingdom was not explicitly mentioned. Therefore, based on the information provided, it was impossible to determine where the capital of Qing Kingdom was.
The capital of the Qing Kingdom was in Daqing City.
The capital of Qing Kingdom was the capital city of Japan. The Qing Kingdom's Kyoto referred to the city of Kyoto in Japan. It was the capital of Japan from 794 to 1868 and was located in the center of the current Kyoto Prefecture. Thus, the Qing Kingdom's Jingdou referred to the Japanese city of Jingdou.