I learned about the Smoke Signal Station and a lot more, But I'm going to talk about the Smoke Signal. Another word for the Smoke Signal Station is Bongsu. The Joseon people used Bongsu for communications. The Bongsu looked like a row of chimneys. Smoke was used at the day time and fire was used at night. 1 smoke means normal conditions, 2 smoke means the enemy has been spotted, 3 smoke means the enemy is near the border, 4 smoke means the enemy has crossed the border, and 5 smokes mean the fight has begun. I thought that it was kind of scary for me when we were looking around. I felt sad for the soldiers that sacrificed themselves for the country.