I loved this drama from the very first episode! I was originally not planning on watching this b/c I'm not a die-hard fan of either Seo In Guk or Jang Nara (although I do admit there acting is good - just their drama choices weren't always my taste). But I decided to check in on this drama after seeing so many good remarks on the feeds - I watched the first two episodes back to back and got hooked - It was one of my most anticipated dramas every week after that. Story: About a criminal profiler who works as an adviser to a team of investigator cops, they solve crimes together - but there is also a bigger mystery that ties Cha Ji Ahn and Lee Hyeon together. Cast: Seo In Guk as Lee Hyeon did such an outstanding job that he has now worked his way into my favorite actors list! The stoic expressions and serious tone of Lee Hyeon's personality was so perfect I'm amazed! I loved every single expression (his eyes told most of the story), his blunt ways of saying things always had me laughing. He is trying to find pieces of his past that are missing in his memory. Jang Nara as Cha Ji Ahn was a strong-willed, stubborn and fun girl to watch - her "stalkerish" ways of following Lee Hyeon around were almost embarrassingly amusing :P I have to say her character in this drama is my favorite of all her characters. D.O's brief scenes were seriously good. Lee Joon Ho (Choi Won Young) - I was constantly wondering what was running through his mind, how his brain worked - his thoughts were such a mystery to me! One look could say a thousand different things. Seon Ho (Park Bo Gum) was at times creepy and at times adorably cute^^ The child actors were amazing - you could really believe they were the younger-selves of the older actors - in both looks and personality/acting abilities. Lee Chun Hee was such an adorkable character^^ Loved him, he could be clumsy, funny, sweet, and brave! Such an admirable man! The rest of the investigation team were great, I particularly liked: Kim Jae Yeong (The cute detective - my first time seeing him) & Min Seung Wook the silly dork - I couldn't help but laugh at his reactions to "Dave" lol :P I was glad to see Seo Young Joo appear on here for one of the cases - love this younger actor ^-^ Music: 'I Remember You' by Dear Cloud (my absolute favorite song), and 'I See You' by Shin Yong Jae (my second favorite song on the latter part of the drama). Re-watch Value: 10/10 - I will be re-watching this drama soon! and I highly recommend it to detective/crime drama lovers! :D <3