Joy of Life was a story set on Earth after the nuclear war. In this setting, the Earth experienced an ice age after a nuclear explosion, causing modern civilization to be frozen underground, and new humans gradually developed. Therefore, it could be said that the Earth in Joy of Life was frozen.

Joy of Life was a story set on Earth after the nuclear war. The explosion of the nuclear bomb caused the earth to fall into destruction, and nuclear radiation filled the atmosphere. Modern civilization was frozen underground, and new humans gradually developed. These humans were a mutated species that could coexist with nuclear radiation. There was also a military museum in the story, which was managed by a supercomputer and a robot emissary. By suppressing the development of human civilization, humans were always stuck in the feudal era. Therefore, Joy of Life's background was a high-tech future draped in a martial arts shell. Earth had experienced the frozen era after the nuclear war, and there was a military museum that controlled the development of human civilization.
The frozen period in Joy of Life referred to the ice age on Earth, which caused almost all humans and the civilization they created to be sealed under the ice. Only a small number of people survived through hibernation. This frozen setting made Joy of Life a very imaginative sci-fi work, showing a frozen world full of fantasy. However, the search results did not provide clear information about the specific time span of the frozen period and other details. Therefore, I don't know the exact details of Joy of Life's frozen period.
The frozen world in Joy of Life was set in a future Earth that had experienced an ice age. According to the description in the series, humans entered the Ice Age after hundreds of millions of years. Almost all humans and the civilization they created were sealed under the ice of the temple. Only a small number of people survived through hibernation. Ye Qingmei was one of the survivors, and Fan Xian had survived through the memory transplant experiment. The humans in this frozen world helped the new humans create civilization after they woke up, and the temple monitored and guided the development of humans through the Oracles and Tianmai. This setting made Joy of Life an extremely imaginative sci-fi work, showing a frozen world full of fantasy.
There was currently no definite information on when the Earth would enter the next frozen period. Ice ages were periodic and usually lasted for tens of thousands of years. However, the polar glaciers on Earth were currently melting. This was because the human impact on the Earth's climate was beyond the Earth's natural tolerance. Global warming led to an increase in greenhouse gases, and carbon dioxide was one of the most important factors. Past studies had shown that global carbon dioxide molecules decreased during the expansion of glaciers during the Ice Age, but increased during the interglacial period in summer. However, one study predicted that the weakening of solar activity could cause Earth to enter a small ice age, but the exact time and impact were uncertain. Therefore, there was no definite answer regarding the next ice age on Earth.
Joy of Life: The Frozen World is episode 28.
In the original book, Celebrating Years, Xiao En and Ku He had discovered the frozen city. Xiao En and Ku He were two experts from the Beiqi Kingdom. During an expedition, they discovered a city that was frozen in ice. After some exploration, they found that there were many corpses and treasures in the city, as well as a mysterious mechanism. Xiao En and Ku He tried to open the mechanism, but it suddenly activated, trapping them inside. I don't know."
In " Celebrating Years," the modern world was frozen underground, and a new human civilization rose above the ice. Therefore, it could be said that the modern world of Qing Yunian was frozen.