Firstly I have to say: I really loved Gu Yanzhen :D He was my favourite character!
The first half of my review won't contain spoilers, so you can read it, I wrote down where I'm starting to write about spoiling things.

I finished this drama only because lately I just keep dropping and dropping dramas, and I didn't want also to drop this one. The story at the beginning looked good and promising, like we're going to see a woman pretending to be a man and join the army, which was a good starting point, but as the story kept going, the quality just kept dropping.

I would like to start with the story. A lot of things happened, which was meant to be exciting, but too much thing happened, and after a few episodes they closed every storyline, so it felt like nothing really happened at all. There was some plotholes and unnecessary scenes, and for some things we didn't get explanation or the explanation just didn't make sense. After a time it was boring, also because we knew everything, they told us every secret and every situation, which weren't surprising anymore when the main characters learned about them. Since I've watched quite some dramas, I always had the feeling that the creators just could've deal with the scenes somehow else.

Secondly, the characters. The main characters were mostly ok, I loved Gu Yanzhen, Xie Liangchen, Shen Junshan, Huang Song, and also Ji Jin, but for the others, they felt too boring, they were too annoying or I just didn't like them. Especially Qu Manting. I hated that woman. There were also times when the acting looked forced and a little cringy.

But to say something positive, the OST was really good. Sometimes we could hear that they cut together or apart the songs, but most of the OST's were good and I liked to listen them :D

Thirdly, I would like to talk about concrete things about the drama. It's gonna be full of SPOILERS, so don't read it if you didn't watch the show.
- How could Xie Xang pass the medical examination at the first episode? The doctor clearly said she can't pass if she's not going to get undressed, but she magically passes the examination? :D
- The two characters death at the end (I mean Huang Song and Li Wenzhong's deaths) was really unnecessary. I know they wanted it to be sad and emotional, but it felt like they killed Huang Song only for this reason. For Li Wenzhong's death, I couldn't understand at all. Why did he get himself killed? I get it that he felt bad for Huang Song, and he felt like it was his fault, but please, don't kill characters for this reason, it's unnecessary, Li Wenzhong could've done a lot of useful things instead of getting himself killed for nothing! -.-" This is really annoyed me.

Overally, I wanted it to be better, I wanted it to love more. But it is only a 6.5 for me...