The cover of this drama really caught my eye. I have dropped this drama twice before at episode 1. After years I came back.....I'm glad I gave it a third chance. The first episodes were very good, especially the story and the action of ML character. That's also what keeps me from watching all to the end. The second couple also had a good love story, but it's sad that the love story ended so fast for them. How much I wish that there was a separated drama for their love story.

Acting: I started this drama because of Joo Won. I really liked his acting in Good Doctor, so I had high expectation. He did a great job here too. I like when he acts a 'special/mystery' person, his character Yong Pal. He acted cool and makes me want more of his action drama's or as an action doctor.
Kim Tae Hee' s acting felt disappointing for me. I mean she can act, but I guess this character didn't suit her and I didn't see a lot of expression from her as someone that wants to make her enemies payback for there crimes. I have seen her acting in many dramas before. She is very good at princess type of characters or sweet romance characters. Here I find her acting too bland as the FL character. Everytime I watch her part, I can think of a lot of beautiful South Korean actress play this character more suitable than her.
The supporting casts did a good job. I really like Chae Jung An and Jo Hyun Jae as an Onscreen Couple and their love story in this drama. More than the lead couple.

Music was good especially the song A Nightmare by Yong Joon Hyung and Heo Ga Yoon.

Rewatch: I really like the beginning of the story and the story of the second couple in this drama. So I will rewatch selectively.