Bruce, The Korean: Sentence-final endings ~군요

Typical sentence-final endings are speech level endings, such as the deferential, polite, intimate, and plain endings. However, sentence-final endings also include various sentence-final suffixes, such as 지, 군, and 네. These suffixes, combined with 요 “the politeness marker” can serve as sentence final endings that convey the speaker’s various psychological states or attitudes. This unit introduces three sentence-final endings, ~지요, ~군요, and ~네요.

The sentence-final ending ~군요

The one-form sentence-final ending ~군요 is used as an exclamatory ending. It is used to express the speaker’s immediate realization to what he/she just perceived. The meaning and usage of ~군요 is similar to those of ~네요 in that both indicate what the speaker just realized. However, there is one subtle difference. While ~네요 indicates that what’s been realized or perceived is contrary to the expectation, ~군요 simply expresses the immediate realization in a straightforward manner.
~군요 is used after adjective and copula stems. However, for verb stems, ~는 “the noun-modifying ending for verbs” is used along with ~군요. Consider the following examples:

After adjective stems