On that day, when it rained in Changbai Mountains, 500 yuan was chartered to and fro to look at swans. On the way, we passed Changbai County across the river to see Korea. The characteristics of looking at swans were 15 valleys and volcanic columnar joints. The rain had a different flavor on that day. Unfortunately, the crater has not been exploited, and it is said to be beautiful in the old mountains and forests.