I'll don't usually write reviews on MDL, but since I'm starting to get about into watching Asian drama after three-four year hiatus, I'll might as well because this is the first drama I'll got back into after my hiatus since I'll heard many good reviews about it and I'll might as well give it a try. Now, that I'll finish watching it, I'll can finally say that this is my favorite Korea drama of all time after Master's Sun.

Story:
The main description of this drama got me into watching this drama: "The male lead suffers from multiple personality disorder that span into several different personalities." I'll like how the disorder shown in the drama is original unlike the other dramas and movies I'll seen with personality disorder. For instance, each of the seven personalities seen to span in different genres: Perry Park and Yo Na is comedy. Yo Sub and Nana is tragic, Shin Se Gi is action/thriller and Mr. X is mystery. I'll like how each of them contain many moments once they appear in a episode and also their characters develop along the way.  Also, the storyline between the main leads is huge mystery that keeps you guessing for more and contains many twists that you never expect in the second half of the drama.Not only that I'll love the chemistry between the main leads, but also the brother-sister relationship with Oh Ri Jin and Oh Ri On, Oh Ri Jin's relationship with her parents and the relationship with Cha Do Hyeon's personalities.  

Acting:
Ji Sung's acting in this drama wants me to get started watching his other dramas and movies. The way he portrays the different personalities such as changing his voice and character makes all of them seem realistic and feels like their were actual people. The scenes where he portrays each of the personalities were never out of character and you feel emotional drawn to them.  Once a personality leaves, it makes you want more scenes with them and hoping their appear in another episode.  Also, his real character, Cha Do Hyeon has emotional moments  and it shows how much he suffers through his family and his disorder.

Hwang Jung Em is amazing portraying Oh Ri Jin. At the first few episodes, she can easily run you off as annoying, but once you get to learn more about her as the story develops, you realize that she is suffering the same way as Cha Do Hyeon. Her chemistry with Ji Sung was amazing since I'll saw them together in their last drama, Secret which is also a good drama and has many amazing moments between them.

Park Seo Joon, who is Oh Ri Jin's brother were also able to portray his character well and his sibling relationship with Oh Ri Jin really connects with you and hoping they have a perfect relationship toward the end. He have funny moments between his sister and Yo Na, one of the personality who has a huge crush on him.  

The side characters in the drama were also amazing especially Secretary Ah and the good and bad side of each of the main lead's families really portray their characters well.

Music:
The music is this drama was amazing and it suits well in every scene especially the emotional moments in the drama.

Rewatch Value:
There were be a time in my life where I'll might rewatch this drama again once I'll get finish watching other dramas, but I'll will come back to watch my favorite scenes in the drama once in a while.

Overall:
This drama is amazing and became my favorite drama. I'll highly recommend this drama for anyone who is looking for a drama that will put you on the edge of your seat with the mystery, make you cry with the emotional moments and also make you laugh with the comedy. Honestly, this is the drama that you must put in your "plan to watch" on your watchlist.