Yeah I agree, Jisoo is goddessly pretty. But this drama is rotten. It has a bad plot while getting controversies in South Korea itself. Here are some suggestions before you read the pros and cons.

Suggestion:
- Crash Landing on You's plot has a lot of better ending/conflict resolutions than this one.
- If you are looking for an action-romance drama, one of the best is titled "Flower of Evil".
- If you aren't a fan of Jisoo, I don't recommend you to watch this drama.

Pros:
- Jisoo's acting is pretty good in her debut-as-main-female-lead.
- The filming set (Hosu Women University Dormitory) is one of the best in K-Drama history. I can say the dormitory is on the same level as Hotel Del Luna.
- The OSTs really match with the drama's theme. I love the opening and ending (choirs) soundtrack!

Cons:
- Don't expect much from its "action" aspect. This is a really cheap romance drama. The couple is busy hugging each other on the battlefield while defending themselves from the enemy's attack.
- Inconsistent character. Young Ro is portrayed as a girl who is afraid of bullets, but she comes back to the battlefield just to meet her beloved one.
- Titan-sized plot hole. Yes, there won't be a season 2, so the hole is forever there leaving watchers confused.
- Worst conflict resolution. In episode 16, the plot skips much. You won't know how the antagonist side gets defeated.
- The plot is not solid. Too many lovey-dovey scenes, staring at each other's eyes too long accompanied by the OSTs, etc. You can even skip these kinds of plots without losing the story. I skipped much too.
- This drama itself has controversies and already got canceled by Koreans. So, I believe the writer is too afraid to make the plot become how it's supposed to be.
- The political talks are really hard to understand (at least for me) :(
- *

*will be added if I remember what to write.