Watching Rooftop Prince

I'm watching Rooftop Prince for the second time. I love these historic, time travel dramas, and I  have to say some of the characters in this story make me sick to my stomach, especially Se Na, Hwa Yong and Tae Moo. There actions are absolutely disgusting and cruel. I feel sorry for Boo Yong, Park Ha, Tae Yong and Prince Lee Gak to be related and involved with these horrible people. I honestly don't know what led me to watch this drama in the first place, other than being historical and time traveling TV series. Could it be the story? Or, maybe to see that Park Ha, Boo Yong finally get justification for what happened to them?? Whatever it may be, I can honestly say I've quite enjoyed watching each episode till the very end, even with evil people like Se Na, Hwa Yong and Tae Moo, it still was quite interesting watching how the characters in the story reacted towards the other.