I will be extremely honest (And I will try my best not to give spoilers, I promise):

To begin with, this series presents us with 2 different stories. This series is actually a story that is being told by a man in the square. From episode 1 to 16 it is a story about a spy who is the princess's look-alike and switches places with her to spy on the palace.
For some reason in episode 17, the people who are listening to the story get angry, and say that the story "didn't end well!", so the man who is telling the story decides to start all over again, and tell a new story TOTALLY changing the story. origin and personality of the characters. It's no joke, LITERALLY THIS happens.
They completely ignore the story of episodes 1 to 16. There were people who died, there were moments when we felt distressed, but they simply said "That didn't happen, forget it, let's start over" and excluded these characters. In the new story they only kept about 4 characters (along with the protagonists), and the rest they threw away and changed the cast.

Now let’s get to the specific points:
* The main couple is only a couple out of pure convenience, as there is practically no romantic development for them.

*All the other couples in the series are better than the protagonists! It's no joke, any other romantic story within the series is better. Actress Bai Lu plays 2 characters with 2 romantic stories, and the 2 romances are better than the main romance. Actress Zhao Lu Si's romance story is also better, and the emperor's lover's romance story is also better... Anyway, even the TRAGIC romantic stories that happen in the series are more beautiful than the main couple's romance.

*The female protagonist is only intelligent when it suits her, she is completely stupid for most of the series, acting like a child, then when something goes wrong she becomes the reincarnation of Sherlock Holmes.

*Everyone in the series hates her and wants her to die or go back to her palace, even the protagonist acts as if "it doesn't matter" to him.

* The secondary plots are attractive, but the main plot is this nonsense from the protagonists and it's very boring. If the story were about General Feifang's story, I believe it would be incredible, but it's not. I only felt relieved when these other characters appeared on the scene. I might have been angry with them (since some of them were bad), but at least I felt something.

*GOOD SIDE OF WATCHING Untouchable Lovers:

- I managed to watch Zhao Lu Si playing the villain;
- Now I have a series to put on the podium as "Worst series I've ever watched". So, whenever I watch something bad, I can say: "This show may be bad, but nothing beats the HORROR that was Untouchable Lovers."