What should have taken me a day or two to finish made me take even longer because I almost gave up watching the whole thing. To make a long review short, I highly recommend you don't watch it.

I was really intrigued by the premise of the story. A modern actress gets sent back in time to the era she is portraying, and tries to navigate that world while looking for a way back to her time. Meanwhile, getting caught up in a love she had no intention of having, and having to choose between going back or staying. It sounds great right? However, while whats on paper is sort of what we get, it gets hidden behind a terrible production.

I'll start with the good:
-The episodes are short, just a half hour, so if you are really dedicated, you can finish it in a day.
-Once I understood the point, I was ok with the weird edits in the middle of the episodes. They stop them about 2/3 of the way into the episodes, though.
-General Ko Il-yong. I can't really explain why, but I just liked his character. I think he was the only one that didn't take his role so seriously, and was good enough to have fun with it. He was over the top at times, but he was enjoyable.
-Gong Seongyeon has an amazing singing voice.

And now the bad:
-It looks so low budget. The wigs and props look incredibly fake, almost cartoonishly. The wigs especially were really distracting with how bad they were styled on some of the actors. The style is all over the place, and while I am not a Korean historical expert, it looked to me like there wasn't much regard for accuracy at all. That could be due to the budget, but some of the styles seemed really modern compared to how they probably should have been portrayed.
-Most of the acting is really cringy. I talked about General Ko already, and there were a couple others that were ok, but in general, it was hard to watch. I feel bad for Gong Seongyeon, because I have seen her in WAY better productions, and I'm sure she was giving her best, but I really didn't like her character. She was really annoying and didn't really redeem herself all the much to me.
-The plot is a mess. I would have given it a higher rating if it was a straight parody, but it tries to be serious half way through and looses whatever edge it had. In one of the earlier episodes, there was even a 4th wall break, so I almost saw it in a better light. Like "Oh, ok, so I shouldn't care about the plot because it's not important" and then they make it important in the end.
-The second lead couple has a better love story. Not that either was portrayed really well, but I believed that they loved each other more than the main couple. I know people have mentioned that they were one of the top couples in WGM, but I didn't see that here. On Dal looked more like he was going to eat her (and not in a sexy way) most of the time.
-The ending doesn't make sense. I was hoping she would have a similar situation to what happened with Samyong, in which we would see a modern incarnation of On Dal, but nope, the real deal just time jumps out of no where with no explanation.
-With all the behind the scenes shots in the earlier episodes (which I loved by the way, it was one of the good things), they stopped them half way through the series. It's like they changed editors at some point in the show.
-This is a personal gripe of mine, but the camerawork that was done is not my personal style. It's the type that looks like they are shooting a soap opera, with hyper defined pan shots and bad lighting. It highlights even more the fake props and makes everything distracting.

There's probably more I can say, but they are smaller things that don't really matter to me that much.