Agent Shen Du of the Dragon Group is the only successful person in the country's top-secret project "Breaking the Boundary". During a time-travel experiment, he came to a different world that resembled ancient China - the Xuanhuang Realm. This place has been ruled by a tyrant who calls himself "Celestial Master" for more than a hundred years. The Celestial Master monitors the world with the power of mysterious crystals and suppresses all parties with the iron cavalry of Tiger Roaring Villa. No one dares to resist.
Shen Du went deep into the Tianshi Mansion, but unexpectedly discovered that the Tianshi was actually Xie Changji, an alchemist who traveled from the Ming Dynasty six hundred years ago. The two strangers formed an alliance with their own thoughts, but Shen Du soon saw clearly the cruel truth of the Tianshi's rule. He rescued the imprisoned female prisoner Liu Qinghe of Tianshi Mansion and fled to Jinling City, which had been devastated by resistance.
Here, he teamed up with Zhou Boheng, a veteran who had been dormant for many years, to combine modern tactics with ancient weapons, train militiamen, and build equipment. When the iron cavalry of Huxiao Villa approached the city, Jinling City ushered in a bloody battle of life and death that would determine the fate of the world. And Shen Du must find his own way back between the two worlds.
Concept: freedom and resistance, the price of power, the neutrality of technology