I was going to give this drama an 8... but then the last episode happened *cringe* and it went down to a 7. The biggest problem with this drama was the story. It started out really promising. I loved the time travel concept and all the characters had interesting stories and motivations. Then somewhere in the middle it became a huge mess. Suddenly there were complicated time travel rules that contradicted themselves. The characters started to contradict themselves as well, and lose a lot of their motivations and, in some cases, likability. Everything became a big mess, but I held out hope for a nice, neat, happy ending, only to be extremely disappointed. It's such a pity. I really loved most of the characters, mostly thanks to the actors and not the writing. Mi Rae was a very strong lead. She didn't fall into the usual annoying female lead cliches. Kim Shin ended up being really likable despite his first impressions. His smile killed me (in all the best ways). Yoo Kyung was a surprisingly likable female second lead, and I loved so many of the secondary characters, like Mi Rae's brother, Writer Bae, and the rest of the production team. And then there were characters who couldn't be saved despite their charming actors. I'm looking at you, Se Joo! He started out so well. I was cheering for him like I usually do second leads. But then when the plot started getting messy, so did his character. The motivations became unclear and the charm disappeared. The other mess of a character was Future Mi Rae. After awhile I found her really annoying and lost all sympathy for her. The music was okay, but if got pretty repetitive and wasn't always used at appropriate times. Overall, this show was a big disappointment. The only reason I finished it and gave it as high of a rating as I did was because I ended up caring about a lot of the characters. I really wanted to know what happened to them each week. If only they'd gotten a decent ending...