I was very excited for this drama when it was first announced. It was Yoo Seunghos 1st drama after the wonderful and amazing Drama 'Remember - War of the Son' and I love him because he is an amazing young Actor. And I was looking forward to the chemistry between him and Kim Sohyun but honestly I wasn't so impressed at the end. Story: The story is okay. In my opinion it isn't very extraordinary. A crown Prince who fights against the bad guys and falls in love with our heroine, who was falsely asccused and executed. The Crown Prince can't trust everyone but a few people who make him stronger. The Beginning of the drama was good, but later I was a little bored. I don't know why but when you've watched this and Seven Day Queen at the same time maybe you will understand me. Acting/Cast: The cast was the main reason for watching and awaiting this drama. And it is the Main Reason because I give this drama a 8.5 and not a lower rating. Yoo Seungho played the real crown Prince Lee Sun who has to face the angst to die since he was born. He loves the people even though they talk very much but he is a little naive. But Yoo Seungho played the role very good. Honestly I would love to see him in a melodrama with romance soon, because saeguk dramas have their weakness in this aspect. Seungho is one of the best actors when it comes to crying scenes (after Lee Junki) and he proved it again in 'Ruler'. In my opinion he was the stongest Actor in the Drama. Kim Sohyun was very good, too. She is one of my favourite Actresses, but she was annoying towards the end. It wasn't her acting but her role. I don't knwo why but sometimes I questioned myself, why Gaeun was the 1st lead. Her Role wasn't written well, but she did her best. And for such a role she was very very good. For Yoon Sohee I have to say it was the opposite. Her acting was bad at the beginning but her role was well written. The development of Hwa Gun let me thought that she would be better the 1st lead. Sohee did a great job after about 10 or 11 Episodes. Kim Myungsoo (aka L of Infinite) was okay. At first I didn't like his acting, but at the end he was great. He did better than in his previous projects. His role was nice written and he acted well. The supporting Actors and Actresses were also good. To name some of the best of them: Heo Joonho (as Daemok), Shin Hyunsoo (as Chungwoon), Lee Chaeyoung (as Maechang), Bae Yoorim (Mooha) and Park Chulmin (Woobo) were some of the Actors who carried the drama until the end. Without them it wouldn't have been a drama I would rate 8.5. So yes the Cast was the best Aspect of the Drama... Music: The OST has very good Songs. My favourite is from Hwanhee (maybe because I love his voice). But I also like the Songs from K.Will and Hwang Chiyeol. My wish to watch it again isn't very big but before I miss Yoo Seungho too much I would do it...Maybe, if I don't want to watch one of his other dramas again. I hope I could help some of you a bit.