This drama is super funny because you can find all sorts of funny recruits acting blur or acting funny during the training. I laugh until my stomach pain through out the series (the series is not completed yet though).
Not only funny as I mentioned but this drama also shows how people's feeling changed in the process of their training in BMT. At first those recruits, Corporals and Sergeants do not really like/appreciate how Second Lieutenant Sun An Bang conduct his training for the recruits as he was strict and go against the rule book of training recruits.
But as the times goes by, Second Lieutenant Sun An Bang passion saw by the recruits, Corporals and Sergeants. Together, the recruits even help Second Lieutenant Sun An Bang out when he is in trouble due to some conflict with gangsters due to money lending problem caused by his father.
After the incident, the captain decided to used his traditional method to train up all these recruits before they passed out from BMT.
Are all the recruits able to pass their physical test in BMT? We shall find out in the final episode of Rookies' Diary.