Lin Yan, a fifty-year-old academician in nuclear weapons research and development, devoted his whole life to the country's most important weapons, but his life ended abruptly at his peak due to years of radiation and overwork. When he was dying, a mysterious system was suddenly bound - "Complete the tasks of survival and upgrading in another world, and you can return to the living world."
His obsession with unfinished projects made him hold on to this life-saving straw. When the extremely rigorous thinking of nuclear physics collides with the bizarre world of immortality; when precise calculations replace brute force cultivation, when a profound understanding of energy turns into a unique path to immortality...
The academicians who forged swords for the country in the past will use science as their blade and the system as their boat to make their way step by step in a different world filled with spiritual energy. Not only did he want to survive, but he also had to bring an incredible "methodology of cultivating immortality" to fight his way out, just for the sake of that sentence - "I still have an unfinished mission and must go back."
The early stage is a bit long-winded.