Iron Fire Reflects the Setting Sun

In another world, 1644, the Ming Dynasty was in turmoil Li Zicheng's troops arrived in Beijing, and the Qing army set its sights on Liaodong. Fighting continued in the court, and the people were hungry and cold. The mysterious general Zhang Zhenyuan led a 7,000 firearms battalion (is there really 7,000) to Beijing quietly, and used thunderous means to clean up the military and political affairs: checking for corruption among nobles, stabilizing food prices, and repaying military pay, trying to use iron fire and power to reverse the fate of the country. Blacksmith Chen Tie and apprentice Wang Er were involved in the torrent. One made swords for his family and country, and the other joined the army for his beliefs. And in the dark, some people have begun to collude with the Qing army and lay out a conspiracy to kill the king and usurp power. Power and ideals collide, loyalty and betrayal intertwine. This is an apocalyptic tragedy, but also a huge gamble that changes the situation. Under the roar of firearms, where will the Ming Dynasty go? (The story is purely fictional and has nothing to do with real history)