i thoroughly enjoyed the whole series, so much so that i wont like to point whatever plotholes it has. what i loved the most about it is that it highlights how the human brains work and how we can control our brains with our will. the character of Shin Ha Ru was the best, relatable on an intellect level and very practical and that of Geum Myung Se was relatable on the emotional level- though Myung Se was an over empathetic human. i loved the co-ordination between the two characters, how they balanced each other out and how the story unfolded. the chemistry between the two actors was commendable.
THE CHARACTERS:
talking about Ha Ru, i really liked it how everything around him was chaotic yet so in order. he knew how to handle himself and (the brains of) others. he is best psychopath i have come across (,,,^_^,,,). Again the best about him was how practical he was. i know some may find him as a character who can exist only in fiction, but it wasn't the case for me. especially Shin Ha Ru's initial opinion on his memory loss (distortion) was something i always wanted other characters of other dramas with a memory loss track to have; and this opinion made the character a little real to me. he said "My brain has blocked the memories that are painful to me and there's a reason to that. why would i go against my brain when i know it would hurt me?" this dialogue had me. and another admirable fact was how Ha Ru didn't give in to any manipulation whatsoever. Jung Yong Hwa did real justice to the character of Shin Ha Ru.
[this Ha Ru is my next favorite Ha Ru after Number 13 Ha Ru from Extraordinary You]
next up is Geum Myung Se. i think no one would have played that role better that Cha Tae Hyun. since i couldn't relate much to this character i cant say much about it. all in all, Myung Se's existence was of real importance for Ha Ru- he made him realise the importance/ the feeling of having a friend. the love-hate relationship they shared was so good and so funny. however, Myung Se being overly empathetic was a little over the top.

THE CASES:
the cases involved were so unique in their own ways and they had my full focus. mystery, suspense and even the drama was evenly scattered throughout. even case was like a lesson to me (even though some may not be a real lesson). i found Ha Ru a lot cooler in the second half of the story compared to the first. However, the ending seemed to be rushed. scientific in every way, while not so in the last 2 episodes to be precise, i couldn't understand the real motive of the final antagonist- what the hell he wanted to prove with harmonizing the the brain waves of two totally polar opposite people, is beyond my range of comprehension.

THE OTHER ELEMENTS:
the actors did a great job. the comic timing was perfect. there were some boring parts, but whatever it has A HANDSOME HOT PSYCHOPATHIC NEUROSCIENTIST (ufffff) and even the music was good. to those who like such science fictions and hot scientists and comedy and can sit through even the yawning parts, then please watch it. it's worth it.