I cannot sing this show's praises loud enough. My vocal folds simply won't allow me. Everyone's said it, but Ji Sung is a serious pro. He didn't just explore his main character... he got into all seven of them (even the short-lived Mr. X). I bust out into involuntary laughter whenever Yo Na appears, get misty-eyed at Yo Sub, connect with Se Gi, giggle at Perry Park, and it just amazes me that you can SEE the difference in Ji Sung's face and body language with each personality. I'll say it again: PRO. This is the second time I believe he and Hwang Jang Eum have paired up together. I'll admit I haven't seen their first drama together, but bet your bottom dollar it's next on my To Watch list. Ri Jin was fun, spunky, sassy, dramatic, and serious in just the right amounts that flowed with the story and how she interacted with the personalities. The chemistry between Ri Jin and Do Hyun was on fire, and I totally love that he was the one who fell first. Although Ki Joon and Chae Yeon's stories were not the main point of the show, I'm kind of glad the first love/competing-for-CEO drama tropes weren't as prevalent over the half-way point. Those stories can drag a drama down. The story was fun, energetic, dark, romantic, hilarious, and just had an all around engaging plot that left me on the edge of my seat wishing I could time travel to the next week for the following episode. I went back and rewatched those beautiful kiss scenes (though the last one in Episode 20 could have been lit a lot better). I want Behind the Scenes clips ASAP. I definitely recommend this drama to someone who is ready to face some darker themes, company secrets, doctors for the most part obeying patient confidentiality, and anyone who wants to witness some STELLAR acting.