Famous Song from Another World

She was once recognized as a top student all over the world. Once I traveled through time, I came to a world of slash-and-burn farming and war. Join the army? Are you kidding me? Is farming too hard? I'll invent the planter. Are the people illiterate? I came to make paper and build an academy. Cotton is such a good thing, but it is only used for viewing? She invented perfume and improved food. She is the gospel to thousands of women. Some people say that she can provide peace of mind for national policy at the top level and the people at bottom level. "You said the legendary person is called Gu Qing?" "What's wrong?" "I also know someone named Gu Qing, but she is a medicine seller." "Ding! The system is started and the host is successfully bound."