Where do I even begin? This drama is gorgeous. It's so well written and paced. The plot jumps right into the perfect family life of Baek Hee Sung and Cha Ji Won. They are happy and in love until Heesung's past starts to catch up with him.

The plot is a rollercoaster with a good blend of a crime thriller and romance. Heesung and Ji Won have a beautiful life together, but he has a dark past she doesn't know about. When everything starts to unravel, the drama does a great job showing Ji Won's conflicting emotions. She is heartbroken and confused. But, her love for her husband and keen intellect eventually lead her to the truth. The first couple of episodes creates an air of mystery around the main character. Heesung's real motivations are unknown. He may be a villain because of his violent reunion with Kim Moo Jin. But, as the story progresses, we slowly find out that not everything is as it seems.

The pacing is surprisingly good from start to finish. The use of flashbacks is very well balanced and gives just enough background without deviating from the present storyline, and, giving a glimpse into Heesung's childhood, the person he is supposed to be, and the beginning of his and Ji Won's journey to love. There are no filler arcs. Every character is relevant and plays a part in the plot development. Every twist and turn is thrilling and adds to the complexity of the story. One issue is that the main villain is revealed very late in the show creating some issues with pacing and plot continuity. But, it doesn't hurt the storytelling too much and the drama is able to bounce back. Another issue is longwinded melodramatic scenes. The writers probably wanted us to delve deep into the characters' thoughts. But, the overly dramatic scenes often feel excessive with the actors overplaying the characters' emotions. And, the human trafficking arc is out of place and completely unnecessary, especially in relation to serial killers finding their victims.

The drama has one of the best love stories I've seen in k-drama. Lee Joon Gi and Moon Chae Won have unforgettable chemistry and do a wonderful job relaying the characters' emotions. Heesung and Ji Won are truly soulmates who cannot live without each other and go to great lengths to stay together.

The acting goes without saying. Lee Joon Gi perfectly relays Heesung's love for his wife, his struggle to understand himself, and trying to cope with the injustice done to him. Kim Ji Hoon is dynamic and absolutely believable as an insanely good looking psychopath. The OST is beautiful and fits well with the story. "Fee you" is one of my favorite songs now.

All I can say is that despite the drama's few shortcomings, this truly is something that took my breath away and made me miss it after it ended. Definitely recommend.