Zombie Research Diary

On December 7, 2190, mankind was defeated. The last group of people left the earth under cover and looked for a new habitat in space. As one of the last soldiers left on the earth, looking at the few remaining humans, I risked my life and decided to go back to the past, study the types and weaknesses of zombies, and solve the problem from the root. After the zombies were on their way, I took a time machine and went back to the day before the zombies broke out. (For future generations to better deal with zombies, I leave this diary and hope you will read it carefully.)