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The red mist descends, causing global biological changes. Human beings are no longer at the top of the food chain, order has collapsed, and human nature is extremely distorted in the face of survival. 72 Hours before the end of the world. The protagonist Lin Mo returned to that sultry afternoon, three days before the red mist enveloped the city. In his previous life, Lin Mo's hoard of supplies was looted because he trusted his neighbors and his girlfriend, and he was eventually pushed into a group of zombies to eat. In this life, he not only wants to survive, but also demands his life from those betrayers. The protagonist has awakened the "space folding" power (can only store items in the early stage, but can fight in the later stage), and has ten years of survival experience in the previous life, and is familiar with all safety points and mutation rules.

In the parallel world of Blue Star, although China has a huge economy, it has long been subject to technological blockade and sanctions by the "Atlantis" Federation in the fields of high-end military industry, aerospace engines and precision materials. The protagonist Lin Chen was a top military expert in his previous life. He died suddenly due to overwork and was reborn as a high school student. Faced with the dilemma of failing the college entrance examination and the country's technological barriers, he decided to use the system, starting from a college entrance examination physics paper, to rewrite the fate of a great country.