TKEM was supposed to have the best of everything: the most successful screenwriter and director, extremely popular actors in an ensemble cast and a lot of money being into production. We were hyped for months. All of it unfortunately could not save this mess of a show that it became.

Pros:
1. AMAZING CINEMATOGRAPHY: Everything is beautiful.
2. Lee Min Ho in all his glory.
3. Woo Do Whan in his double role is extremely convincing and is the best part of the show.
4. Most of the actors in this large cast have done a really good job.
5. Interesting concept of parallel worlds and time travel.

Cons:
1. Very annoying FL. I do not like her. I'm disappointed with Kim Go Eun's portrayal of Tae-Eul. The character herself isn't very likable either. The way they styled her is also drab and disappointing considering the contrast with the King who is always looking regal.
2. No chemistry between the leads. I tried to convince myself that they look good together for a very long time but I'm finally giving up. Their romance is really boring, no fun moments.
3. The plot is a mess. There are too many characters and none of them is able to make a meaningful impact because its not coherently put together.
4. Kang Shin Jae is given a lot of importance in the plot, but the actor doesn't have equivalent screen presence to pull it off.
5. SO MUCH PPL, the characters not only use the products but also TALK ABOUT THEM. I never complain about PPL but honestly in this drama its very distracting and really pulls you out of the story.
6. The world building is off, Kingdom of Corea looks almost like and Republic of Korea and its hard to tell the difference unless its the palace setting.
7. The suspense is not built up properly cause often the audience already knows what's going on while detectives on the show try to catch up.

Overally the show is a mess. You might want to invest your time into watching the beautiful cinematography, Lee Min Ho and Woo Do Whan.