Traveling Doctor Liu had seen many things from the world.
As for Shan Yu, he himself had been on the battlefield for a long time and naturally saw many things. This included various battles that Nan Hua had done over the years, especially the one during the war between Shi Long Kingdom and Fei Yang Kingdom.
Besides, following Traveling Doctor Liu meant that he was also exposed to various matters.
As for Yu Zheng Xi…
His youth was already filled with killing. What else would he feel when he saw someone died in front of him?
As long as they were not the people whom he knew, then he would not have much thoughts about them. Instead, he would think that it was not important and would forget about it soon enough.
Only Shi Hao Yi was different.