, before the time-travel, I was one of the first girls in town to attend school.

　　I would help proofread articles for the school magazine in my free time.

　　At that time, the emperor was already gone, warlords were fighting each other, and foreign invaders were invading.

　　The royal and noble families were hiding among the common people, and the glory of the past was no more.

　　We changed into fashionable clothes, and there were yellow-covered carriages, trams, and cars on the streets.

　　There were handguns, movies, and phonographs.

　　Scientists, chemists, physicists, and philosophers appeared.

　　It was a time of talented people, shining brightly, and I was only like a speck of dust, drifting with the current.

　　When I was twenty years old, my hometown was occupied, and my two brothers died fighting the invaders.

　　The militia force led by my brother-in-law was wiped out by the warlords who broke in.

　　My sister avenged her husband's death by disguising herself as a singing girl and assassinated the arrogant warlord during a banquet, only to be killed by stray bullets.

　　My parents donated all their family wealth to purchase vehicles and hired private escorts to help me and more than ten teachers from the school transport dozens of boxes of ancient books to escape the war in the southwest.

　　However, in the chaotic times, there were too many evil people, and our group was plundered by several factions, eventually dispersing in different directions.

　　I followed Editor Li from the school magazine and took two boxes of ancient books to hide in a remote mountainous area, pretending to be two teachers and teaching the children there.

　　I never saw my parents again and later heard that they were killed by another group of warlords.

　　Before their death, they were urging the townspeople to flee.

　　Editor Li taught me how to read and explained the changing situation to me.

　　He said that what had existed in the past may no longer exist in the future, and it can also choose not to exist.

　　He said that even if one's life is short, one should have determination and ambition, and even as insignificant as an ant, one should still work for the country and the people.

　　He said, 'Teachers are here to pass on knowledge and solve doubts.' Later, in order to protect me and the students, he personally led the enemy away and died on the opposite mountain road.

　　I led the students alone, crossed mountains and rivers, and searched for a way out.

　　Unfortunately, years of hardships had taken a toll on my health, and I died at the age of twenty-seven, just before dawn.

　　Fortunately, I had entrusted the children to the patriotic army, and they seemed reliable.

　　I wonder how long it took for my country to rise from the mud of chaos afterward? 'Teacher Yun, what's the use of math? I see other kids reading scriptures and history.' I snapped back to reality and realized that all the students were looking at me, waiting for me to explain.

　　This time, I was teaching them math.

　　Yes, ever since I arrived here, I found that the children were reading poems, history, and scriptures, writing and painting, learning rituals and music, but they rarely touched on science and technology subjects.

　　I smiled and said, 'Of course, you should also learn scriptures and history, but math is also very useful.

　　It is the foundation of many subjects.

　　If you excel in math, it will make learning other subjects easier in the future.

　　You shouldn't only focus on achieving scholarly success but also engage in inventions and creations.' Another student said, 'But Teacher Yun, what you're teaching us is so simple.' I chuckled and replied, 'As a teacher, my skills are limited, and I can only teach you this much.

　　When you become more capable than the teacher in the future, the teacher will become your student, alright?' The second half of the class was taught by the class monitor, Gaoyuan.

　　This type of teaching was no longer a difficult subject for him.

　　I didn't have much time left and had to hurry back in case An Wang realized something was wrong.

　　As I was returning through the secret passage, Gaoyuan caught up with me and said, 'Teacher Yun, I have found some information about the task you assigned me.'"

　　"From a young age, Gao Yuan was adopted by the Immortal Qingxia.

　　However, Gao Yuan had ambitions and did not want to become a secluded Taoist priest.

　　He wanted to do something for the people.

　　Every year, I would come here to pray and teach him.

　　Occasionally, I would give some guidance to other children as well.

　　Over time, more and more orphans, both boys and girls, came to attend classes.

　　The knowledge these children now possess surpasses that of the middle school students from my time.

　　I can no longer teach them much.

　　After all, I am just an average teacher and can only provide basic education.

　　Occasionally, I can teach them a bit of knowledge from university, but that's the limit.

　　Fortunately, a few of these students have great talent and will surely surpass me in self-study, becoming pillars of the nation.

　　'What did you find?' Gao Yuan handed me a page of paper, which turned out to be a list.

　　'Teacher Yun, these people are the ones Prince An has placed in the court.

　　After investigating for several years, I discovered that some of these people come from commoner backgrounds, some are from humble origins, and two of them have changed their status after being freed from slavery.' Gao Yuan hesitated and asked, 'Teacher Yun, is he really the ruthless and cruel person you described?' ...What?