Traveling Through Babel

Humanity divides history with wars and rebuilds civilization on the ruins. In 2121 AD, an experiment called the "Tower of Babel" made Gao Meng a member of the historical torrent. History can measure the rise and fall of dynasties, but it cannot measure everyone's life. When the past can be undone, when you can travel through history, who do you want to be? Is it a regret in life or is it a way to save mankind from a future that is doomed to destruction?