In the 21st century, with highly advanced technology, humans have invented time machines that can freely shuttle through time and space. Under the jurisdiction of time and space regulations, people try not to disturb the lives of ancient people in order to avoid causing historical changes. One day in the 21st century, the Earth was attacked by extremely hot and extremely cold beams of light. In order to explore the reasons, day
In the 21st century, with highly advanced technology, humans have invented time machines that can freely shuttle through time and space. Under the jurisdiction of time and space regulations, people try not to disturb the lives of ancient people in order to avoid causing historical changes. One day in the 21st century, the Earth was attacked by extremely hot and extremely cold beams of light. In order to explore the reasons, day