Beginning at the End

Two hundred years after a large-scale nuclear war, the earth has regained prosperity. Under the appearance of harmony and stability, many crises are hidden! As a genius mechanic, faced with various problems caused by the symbiosis between humans and mechas, what choice will you make? Will you be ambitious and want to change the trajectory of history, or are you willing to go with the flow and maintain the progress of history? Are you worried that a random action will cause huge damage to the past, present and future time and space? Maybe the grandfather paradox really happens? To do or not to do? This is a question!