When a mage from another world came in front of Xu Yue, Xu Yue found that his life turned in a strange direction. Relying on the space door left by this unlucky mage, he could travel back and forth between the earth and a strange world .Dwarves, elves, gnomes, goblins, dragons, demons, gods. These legendary creatures appeared in his life one by one. Use guns to fight magic in other worlds, use magic to fight technology on the earth, and use large computers to Algorithmic model, relying on the differences and complementarities of the two worlds, Xu Yue has embarked on a unique path.