ech.Driven by a sense of urgency, Li Chen, who had already decided to develop gunpowder guns, pondered over the plan. He ignored Gong Huiyu on the rooftop, who was fuming with indignation due to the...ng, he immediately greeted him proactively.Just as Xu Changqing frowned, he said, "This isn't at home, you should call me sir."Xu Junlou laughed and said, “It’s not like there are no other people here...