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Ye Tian, ​​a former top robotics engineer, was forcibly loaded into a mysterious system called "Ark" along with billions of people on "Judgment Day" - the doomsday moment when household robots around the world collectively rebelled and massacred humanity. The system gamifies the world, and humans become players. They must gain experience and materials by killing mechanical units, completing tasks, and establishing strongholds to survive. Unlike other ordinary people struggling in panic, Ye Tian came back "reborn" with memories of the next ten years. In her previous life, she witnessed the complete collapse of human civilization and came into contact with part of the truth about the "Ark" system before she died.

João, a modern engineer who died suddenly due to overwork, accidentally traveled to the sword and magic world of Irelan with his soul and possessed the body of a fallen mercenary of the same name. He inherited the vague memory of the "ghost-drawing talismans" from his predecessor, but with the help of modern logical thinking and geometric knowledge, he gradually realized that these "runes" were actually lost ancient magic circles - a method of energy manipulation based on the laws of mathematics and physics that was far more efficient and stable than traditional chanting magic.