This was an old movie, released in 2014, I only picked this up now after so long was because ML used to be one of my favourite K drama lead and I found a source to watch it online.
Personally I used to cringe at such storyline with the emphasis on the over-glorifying of extra marital affairs (EMA). The fact to this story is that both leads did betray their spouses. And ML’s behaviour is no different from the older commander who was trying to take advantage of FL during the dance. The only different is ML is charmingly handsome and FL also has feelings for him.
However after watching this I realised that it really depends on what ‘lens’ you watch with. It’s actually a simple, beautiful, sad love story.
If one watch this with an emphasis on the ML’s story of a celebrated war veteran suffering from PTSD and how he was trying to navigate his life again after the trauma of war. He can’t celebrate his wins and he is tormented, and he discovered a dysfunctional way of coping is being obsessing over a desire at first sight that spark him to live again. And as the show progresses, one will understand why his obsession and desire was the only thing that kept him alive after war, similar to why a lot of war veterans developed alcoholism.
Hence it’s not surprising that he attempted suicide after FL tries to break up with him. Yet even he didn’t die, he was again not given another chance to be understood and recover, instead was punished by being sent back to war and die there. He has literally no second chance and no life post war except that glimpse of love desire.

So I am surprise that I do like this and how the story was told was quite nicely done. The acting were spot on and ML is still charming, although too good looking to be a war veteran. LOL!
So choose the lens that you are going to watch this with and you may just enjoy this differently.