Truth was, Gu Yun was not a good teacher. Much like Shen Yi, he also had the habit of going on about whatever subjects came to his mind. Very often as he finished fighting the iron puppet, he had already explained about how to dispatch and create Heavy Armors formations, what was the proper ratio between Heavy and Light Armor units to distribute to be the most efficient in saving Ziliujin, and even the differences between the horse breeds from the Western Regions and Central Plains, which type of ration was best for fighting against hunger, so on and so forth.

Only until these lectures took one trip around all of Great Liang that Gu Yun would finally become aware and ask Chang Geng: "Did I go off topic again? What did I intend to talk about at the start?"

Chang Geng: "..."

The two sat on the big metal feet of the puppet, combined with the "clacking" sound of the gears turning inside the body of the iron monster, they would try to recall their original topic that had escaped by a thousand miles.

At the beginning, upon hearing that Marshal Gu was personally passing on his knowledge, Ge Pang Xiao and Cao Niangzi were both extremely excited. After overcoming many difficulties and many suppressed yawns, they managed to run over to listen to his teaching. But unexpectedly, from the beginning until the end, they could only feel one thing - what is this!?

Ge Pang Xiao secretly commented: "I feel that it’d be better to listen to Teacher Shen's chanting."

"It’s General Shen, how come you keep forgetting?" Cao Niangzi corrected him with irritation. He pondered for a moment, fighting to choose between ‘beautiful man’ and ‘conscience’. In the end, his conscience won, and he added, "I feel the same."

Only Chang Geng had absolutely no opinion. If he could stay by Gu Yun’s side for just a while every day, then he would be content to even stand guard at the door all throughout the night. After all, his nights of sleep were nothing but repeated nightmares, nothing he’d be reluctant to let go of.

Much like how strongly he believed that he could restrain Bone of Impurity, he believed that he could become a sharp blade, scrape away all the unnecessary excesses every day, including his own strange thoughts about yifu.

What's more, Gu Yun’s lectures were simply disorganized - if one would listen carefully, they would find that the matters he talked about were all valid and reliable.

Gu Yun was brought to the battlefields by his parents back when he was still very young, his few years living a comfortable life in the palace did not last long. At the age of fifteen, he began to follow an old veteran general marching to the South to suppress bandits. Since then, he had continued to roll around in the military until this day.