It was an excellent drama. The theories of parallel universe, monarchy and a love story, were all beautifully woven together. The acting skills were exemplary. The way Lee Min Ho perfectly got into his role as an Upright Monarch was very impressive. Kim Go Eun on the other hand potrayed a strong female lead, her character as Jeong Tae-ul and her acting skills were my personal favourites from this drama. Her character as Luna was also impressive as the character as Luna was completely different from that of the character as Jeong Tae-ul, the formal being a pick pocket cum thief with a vast criminal record, and, the latter being an honest, strong and diligent police officer Wo Doh Hwan also did an excellent job at potraying 2 different characters who were poles apart in personality, one being a stiff and upright bodyguard cum soldier and the other being cheerful and chilled out person. All other actors too did a very good job as most of them played in double roles from the 2 parallel worlds potrayed. The screenplay and direction too was applause worthy.
If you wish to see more of Lee Min Ho, Kim Go Eun or Wo Doh Hwan, kindly watch the following dramas, you sure will love them~
1.The Heirs(Lee Min Ho)
2.The Legend of the Blue Sea(Lee Min Ho)
3.Goblin(Kim Go Eun)
4.Tempted(Wo Doh Hwan)
Also if you haven't, do try to watch the following dramas as they were extraordinarily good~
1.Doctors
2.The Descendants of the Sun
3.School 2017
4.Boys over Flowers(High School drama; Lee Min Ho)