6. Military Prosecutor Doberman - Jo Bo Ah. I thought she was a beautiful actress and well, can play, but it's either her characters were annoying, or it's the way she portrayed. MPD's FL also started off annoying but then I grew fond of her. She was so good character and her interaction with a ML was great, so much chemistry!
7. Bloody Heart - Jang Hyuk. First I saw him in Fated to Love You, I believe. I didn't like him at all. But then, when I watched Bloody Heart, I was mesmerized! Both character and his acting made me fall in love. And his interactions with FL (one of my fave actresses) had more chemistry IMO than interactions between leads
8. That Winter When the Wind Blows - Song Hye Kyo. I wasn't her fan and thought she was overhyped, she seemed always have same facial expressions and all that. I watched DOTS, Encounter... When I saw her in That Winter When the Wind Blows, I was pleasantly surprised. Her acting was wonderful there!
Bonus: The Glory - I already mentioned SHK's work that changed my mind about her, this is second one where I really liked her. But this drama also made me change my mind about Lim Ji Yeon. I watched some of her works before and I found her acting annoying, but here she was superb! Every time I saw her, I wanted to hit her. Her crazy villainess was as good (portrayed) as FL.