This drama is just very well done from start to finish, it never drags and is well paced. Plot exposition, progression and resolution are excellently executed and move seamlessly from one point to the next. My only negative comment regarding plot progression is that the passage of time is not clearly delineated, it's not clear how much time passes throughout the drama especially in the final two episodes I wanted to know how much time passed between the time Jo Min Hyuk went to Armenia and the end of the drama. This doesn't take anything away from the drama, it's just something that niggled at me.

The story is intriguing and very engaging, there's never a dull moment. There are so many aspects to this story:
1. the relationship between Kang Yoo Jung and Ahn Do Hoon which is the foundational plot point;
2. the relationship between Jo Min Hyuk and his pregnant girlfriend;
3. the Ahn family dynamic which is actually the breeding ground of Ahn Do Hoon's selfish, non accountable nature;
4. the dynamic of Kang Yoo Jun and her single father;
5. The dynamic of the Jo family which is multi - layered with suppressed resentments;
6. the hate to love relationship of Jo Min Hyuk and Kang Yoo Jung, a relationship whose progress is beautiful and swoon worthy;
7. The dynamic between Shin Seo Yeon and Jo Min Hyuk;
8. the dynamic between Shin Seo Yeon and Ahn Do Hoon;
8. The prison dynamic;
9. the prosecutor's office dynamic;
10. the corporate shenanigans;

I understand that this was a first script for the writer, it's unbelievable how well this story is constructed especially for a first time script writer. I will definitely look into other dramas from this writer.

I could add a few more plot points but these are the essentials, It seems like a lot but when you're watching it's not, it adds to the excitement and pace of the story.

The acting is excellent. Special mention must go to Bae Soo Bin, he played the reprehensible character of Ahn Do Hoon to perfection, his intensity and progression from a man who wants to do well in life to a man who will do anything to save himself is fascinating to see, like a trainwreck in slow motion.

Special mention must also go to the male lead Ji Sung playing Jo Min Hyuk, he delivered some swoon worthy bars to the female lead with such heartfelt sincerity that I was blown away; this is the first time I've watched a Ji Sung drama and I will definitely put his dramas on my ptw list.

The female lead's story played by Hwang Jung Eum is a tear jerker but ultimately hopeful and good; she is able to showcase the character's essential selflessness and goodness while still injecting some badass no nonsense when its required, I appreciated that she stood up for herself when it was necessary but didn't lose her inner core of gentle goodness in the process. I initially questioned her decision to handle the hit and run the way she did, but ultimately her character was consistent and this became the story the writer wanted to share.

The character of Shin Seo Yeon played by Lee Da Hee is sufficiently annoying and one dimensional, the character is not fleshed out enough for us to care about her motivations.

The rest of the supporting cast is great, especially Ahn Do Hoon mother, there's many a time I wished I could shake some sense into that woman!

The music is excellent and perfectly suited to the scenes where it is applied.

Overall rating 10 because it is so well scripted and acted, with minor to no plot holes.

Rewatch value is 10, I rarely rewatch dramas with suspense in them, but this one has such a wonderful OTP and supporting cast I will definitely revisit it at some point in the future.