I went Seoul museum of Hostory!

I talk about Bongso. Bongso were put in place to alert the king and the people about emergency situations, such as invasions using smork and fire signals, One is fire sign signifiend a usual day. and Two is when the enemies appeared, Three when  enemies crossed to the border. Four when enemies crossed the border, and Five when the war broke out. I was impressed Bongso. Because it was used when people met energency situatious