Cheng Zhe had a reason to change the past. When he accidentally met his former friend Yao Shuyu, he started a plan to change time. However, he soon received a warning from the future that changing time would bring disaster. The person who issued the warning chose to escape from the earth precisely because of the disaster. Cheng Zhe began to hesitate. If saving the apocalypse requires paying the price of life, what is the meaning of saving everything? If saving your loved one requires sacrificing the whole world, should you be happy or ashamed standing on the ruins? However, all cause and effect is far from being as simple as it seems. The master outside time is quietly affecting the thread of everyone's destiny.