Three Stars taken away for:
1. The bad ending - bogus and "wanna be different" ending which didn't stick well with the overall plot
2. Female lead's character - totally unnecessary and annoying
3. No chemistry between the main leads - Seo Inguk and Jang Nara had no chemistry together (occasionally she had chemistry with Park Bogum) however, we were forced to watch an irrelevant and out of place "romance" between the two leads that was never build up. The drama would have been much better without the romance approach.
Seven stars were added for:
1. The beautiful bromance between the two brothers. They were truly lovable and cute. I always loved their interactions on screen.
2. Park Bogum - Excellent performance by Bogummy. He stole the show.
3. Seo Inguk - He was hot but his character could have been an annoying know -it-all if it was someone else acted as David Lee. However, Inguk was charming and endearing as the always talking, boastful but extremely smart, blunt but endearing, strict but caring brother/ professor/ police consultant.
4. The crimes - Reminded me of The Mentalist and Sherlock Holmes. The drama took time (about one episode) to investigate the crime, and take another entire episode for the solving and aftermath of it. And the crimes were always wrapped up nicely.
5. The main villain - D. O was great! But the villain's character was that of a smart, empathetical serial killer.
6. The plot - The psychological aspect of the drama was well thought out and executed. The overall plot (minus the last episode) was very well done. There were obvious mistakes with consistency however, I loved how the brothers were given a prominent place. It was their story. Nothing else mattered.
7. Overall cinematography, fights, side characters - The drama was extraordinary, certainly was ahead of its time, had a great cast who did their job well. This star is for them.
Verdict: Watch it for the bromance and Park Bogum's convincing evil side and to witness the best hairdo and hotness of Seo Inguk.