Wang Cong unexpectedly gains the ability to rewind time upon death, returning to 48 hours earlier each time. He discovers that on December 5 at 7:20 a.m., an alien spacecraft will arrive on Earth and release a white light that wipes out humanity. Determined to save the world, Wang Cong repeatedly rewinds time to test different approaches. After meeting Zhao Gang, a researcher at an astronomical observatory, he learns that the government has already detected the crisis. He infiltrates the Qifeng Mountain Base and Shelter No. 1 in Tibet, encounters strange cases involving Bureau 749, and discovers that He Huaizhong and others are colluding with foreign organizations to collect highly intelligent human brains for the aliens. Through repeated time rewinds, Wang Cong awakens a supernatural mental magnetic field ability and joins forces with Zhu Jun and a pair of twin sisters to fight the aliens. Meanwhile, the world's timeline begins to change, bringing nuclear weapons, mysterious powerhouses, and other unexpected developments.