Conclusion: need to watch it if you have not.
So truly reflecting many struggles in live and somewhat the reality. The characters struggle between just do it like it is merely a job that allows them to bring the bread home or really possess a sense of mission, do the right things and becoming the hero for civilian that is in trouble. Even if that mean losing their own life and earn no gratitude. Sounds like a real world problem there.
I watch it because of actor Lee Kwang-Soo, but end up thinking it is such a great choice. Cast, story, set up, ost, everything is great, so go watch it if you have not!