Okay, so imagine you have a friend named Buddha who taught people how to live a happy and peaceful life. His teachings were so good that they spread to different parts of the world, including Korea.
In Korea, people started practicing Buddha's teachings and it became really popular. They built special places called temples where they could go to learn more about Buddha's teachings and meditate. These temples had big statues of Buddha and other important figures from his teachings.
Buddhism in Korea also mixed with other beliefs that were already there, like shamanism (which is like talking to spirits). So, some people in Korea would go to both Buddhist temples and shaman rituals.
Throughout history, the practice of Buddhism in Korea had ups and downs. Sometimes, people in power would support it and even built big temples. Other times, they would ban it and destroy temples.
Today, there are still many Buddhist temples in Korea and people continue to practice Buddhism there. But like in many places around the world, people practice different religions or no religion at all depending on what they believe or what makes them happy.