To me, this drama is perfect, in the entertainment point of view. Jisung is at his height, in turn of his outlook and acting skills. So smart in his suit as a wealthy third generation of a great family. Female lead is equally terrific, acting as a always pleasant and witty doctor.
Needless to say, the plot excel among all other kdramas, portraying Jisung as a DID patient with 7 personalities. One of his identities as a girl is impressive, with him wearing pink dress running around the street.
In turn if we judge from medical point of view I think female lead is quite professional as a psychiatry. I like her way of treating different identities as friends to help Jisung, and give them each a gift before they are leaving.
Not until I hear an interview of an actual DID patient in my place. He is discontented with many of the movies and dramas which usually portray their identities as harmful and aggressive. In fact, according to him, that is not the case in real.
This is my only negative comment to kmhm. Otherwise in entertaining aspect, it is beyond doubt a perfect drama.