At first, I decided to watch this drama because of Kim Seon-Ho. However, after I finished all the episodes, I fall in love with with the chemistry of D.O. and Nam Ji Hyun. You will smile and laugh while watching this KDrama. I only rated it 4 stars because I don't really satisfy with the ending. To me, this drama doesn't craft a great ending tho it has an expected happy ending that all of us want. A great ending supposed to be memorable. It has to be difficult to erase from anyone's mind. Therefore, in my opinion, 100 Days My Prince have a cliche happy ending.