Before anything else, I want to say I'm reviewing this after my re-watch. I replayed it just for fun.

Story:
• The plot is cheesy and predictable, yet it is fun and entertaining. Expect illogical things to happen. 
I didn't like the main couple ; their story is boring. However,  the second lead couple caught my attention from the start. Yoon Myung-joo and Seo Dae-young's story is much more interesting than the lead couple's story, and they have more chemistry. Another focus of the story is about the other doctors and nurses who volunteered to go to Uruk with the female lead; their story is fun to watch and the character developments are interesting enough.

Cast and Characters
• Song Hye Kyo - My opinion of SHK's acting will always be the same, she's average; her pretty face just makes a difference I guess.

• Song Joong-ki - I don't like him here, he's just trying to be cute all the time, which makes him quite annoying. I prefer his acting in Innocent Man.

• Kim Ji-won and Jin Goo - the second lead couple, their chemistry is better than the main lead's. Jin Goo's acting is on point, he portrayed a military character well. Kim Ji-won has a pretty face and good acting skills.

• Supporting casts - all of them are okay, but no one stood out to me.

Music
• All the songs are good to me.

Overall
• This drama is definitely overrated, but it is fun to watch, and I would recommend it.