The Days When I Was a Lord in Another World

The protagonist, who has traveled eight times, came to the Apocalypse of the Great Tomorrow. He originally wanted to go to the south early to avoid the Manchus entering the country in the future. Unexpectedly, on the sixth day of May in the sixth year of Apocalypse, the Wang Gong Factory exploded, and a door to another world appeared in the ruins. As a noble son and an expert in other worlds, the protagonist led people into that other world. Unexpectedly, the demons and monsters there could not withstand the Ming Dynasty's muskets and artillery. Moreover, the land there was fertile and rich in resources. These good things could support the Ming Dynasty in fighting against the rebels and the Manchus. Of course, just resistance is not the spirit of a time traveler. Unifying all the worlds is