I mean, honestly, a lot of people are watching the series because od Zhu Yilong, who played the main lead, Wu Xie.
And he is overall an amazing actor and in this drama he is amazing once again.

Now don't get me wrong, the other actors are great or at least good to decent as well, but. You can't just switch the main actor with a supporting character's actor for some 10/15 episodes under the pretense of going under cover as someone else!

It made me so. angry. Just why? Why would you put a completely different actor to play the main role for so many damn episodes that contain a few really emotional scenes that I wanted to see Zhu Yilong play!! I have nothing against the actor who plays in Zhu Yilong's place, but I love Zhu Yilong, he was the main actor in the drama for damn 30 episodes before, than some good 15(?) episodes in the next series and then you put a new face for so many episodes, TOWARDS THE END NO LESS, and expect me to be ok? I'm really disappointed in this aspect.

And not only that, Zhu Yilong had almost no screen time during those episodes, even though he played another character, he was shown few times in some short scenes ( which I loved a lot), but yeah, without him, Fatty, Xiao Bai and Sang were the ones who were holding it up for me (uncle Erjing's actor too), but I missed Zhu Yilong as Wu Xie.

Now all of this is juts testament to how great he was in the role, I definitely recommend watching it, just, you know, be prepared.

In regards to music - I loved it quite a lot. The ending song is soooo beautiful and then there is one more song, that gets played in really sad moments, where the singer sings just some vocals with no words and it just makes you want to cry.

Another great aspect is how horror like it is at places, i personally really enjoyed it, it made it all the more thrilling. :)