Han Seok Kyu played Teacher Kim / Dr. Boo Yong Joo / Kim Sa Bu, like I said in the first drama series, this actor is exceptionally good. I love how the screenwriters wrote this character and for HSK to act it out. It was so good! Ahn Hyo Seop another Doctor character Seo Woo Jin, I mean this actor did his part, very believable. I loved that IDGAD attitude. Lee Sung Kyung who played Dr. Cha Eun Jae, OMG an actress that can play what she had to do... OMG when you watch this, understand what she had to visually do for the audience. She was awesome. My favorite again in a supporting role. Kim Min Jae, I want to sing He so Fine, He so Fine! I love the character he played... those dimples tho and his eyes *Boom*! Can hardly wait for Dr. Romantic 3! Thanking all the main and supporting actors/actresses, this drama couldn't have made it without all of them... This medical drama was a team effort. Thank you. I cried in this one.