I Fight Zombies in the Late Ming Dynasty

When he woke up, Lin Chuan found that he had traveled through the late Ming Dynasty. I thought I could use the system to punch Huang Taiji, kick Li Zicheng, pull the reactionary landlord Chongzhen off the dragon throne, and let myself experience the feeling of a feudal monarch. But what Lin Chuan didn't expect was that in the late Ming Dynasty, why were there still zombies?