One of the best romance/suspense drama that I have ever seen. I have never had the concept of what a good drama should be but this drama really set the standards for me. Amazing story. 1.) The main highlight of this show is definitely the different split personalities. I was pretty hesitant about the male lead (Jisung.. I am so sorry about not knowing him before the drama) having 7 split personalities but the story definitely lead well to the backstory of the 7 personalities. I am also impressed by how the writer/s included character development and growth for the personalities making the story interesting and not stagnant. 2.) Romance is beautiful. I really want to talk more about the romance but I think it is impossible to do that without spilling any beans. This is the first drama that made me had second male lead syndrome for two of the characters (I am trying my best) and bromance is simply so natural. 3.) Suspense is the one that kept me going real hard. So many WOW factors in this drama. You will be sooooooo surprised at many point in time and will really expect more and more from the drama. 4.) I will not consider this drama as a medical drama though. I am no medical-expert but I can see that this drama does not really touch on the medical side. If you are going for medical/psychological, this won't be the one (watch It's Okay It's Love instead). 5.) This drama has one of the best ending, really. A nice closure and no possibility for season 2 (which I kind of appreciate as there are many season 2s becoming really forced) I must give credits to the writer/s for the wonderful story. JJANG! Next the acting... Jisung handled the split personalities soooo good. He deserves the Daesung (Grand Prize) so so so so so much. There are many controversies about Hwang Jung Eum's acting (female lead) but I really don't find any problem with her acting. She may be exaggerating at times but I believe it is for the comedy effect and also she did displayed impressive emotional acting in the drama. All the casting is done really well and I have enjoyed the acting of all major/minor characters. ANOTHER JJANG! Auditory Hallucination really gives me the suspense vibe for Kill Me Heal Me. You can feel the painful love with lots of secrets and suspense, with a hope for life and happiness. I totally don't understand the lyrics of the song but I feel it anyway. Its like a flashlight speed recap of the drama every time you listen to the song. There are other OSTs but unfortunately, is not as impactful as Auditory Hallucination. All in all, go watch it! Because this is the drama that taught me what is a good drama in romance-comedy and suspense aspect (and I never thought that this two genre can go so well together). Heart wrenching back stories, beautiful yet painful romance, funny bromance/split personalities moments, heart warming family love, great acting and impactful music. All in one.