# 구나

Source: https://rickcarlino.com/notes/korean-language/patterns/구나.html

https://www.youtube.com/watch?v=klLIyR9yUgA

Very similar to the 군요 ending seen in text books.
This one is less formal and more spoken.

 - 날씨가 덥구나
 - 그렇구나
 - 음식이 참 맵구나