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On the day when Li Hao, a man from science and engineering, traveled through time and became a giant dragon, he obtained an artificially retarded system full of bugs. System: Ask the host to learn magic techniques and then upgrade the system. The reward is magic technology learning materials. Li Hao: I have already learned how to use you, you idiot! Leave it alone? However, the undercurrent of the world is surging. How can Li Hao, who possesses knowledge of magic and technology, resist the invasion of the lower planes? How should we face the invasion of our former hometown? How should you protect your daily life? "No one can stop me from fighting for supremacy in another world. This is a bunch of bastards who only know how to fight among themselves!" The series of dragon city lords fighting for hegemony and farming in another world, please read it and recommend it, thank you~