Okay, kiddo, so in Korea, there were many times when students got together to protest or try to change certain things they felt were wrong. This is called a student movement.
Sometimes these movements were about making changes in school, like wanting better lunches or more time to play. Other times, they were about bigger things that affected the whole country, like wanting more freedom or democracy.
One big student movement in Korea happened in the 1980s. At that time, the country was under military rule, which meant that the military had a lot of power and controlled what people could say and do. Students didn't like this and wanted to have more say in how their country was run.
So they started protesting and taking part in rallies. They made signs and chanted slogans, trying to get their message across. Sometimes these protests turned violent and there were clashes with the police or military.
In the end, these students were successful in getting the government to change. They demanded and won reforms that made the government more democratic, and allowed for more freedom of speech and expression.
Overall, student movements are a way for young people to have their voices heard and to fight for what they believe in. Even though they can be difficult and sometimes dangerous, they can lead to positive changes for the whole country.