Vicious Spirits picked up where Wicked Fox ended. It was nice to see that while Miyoung and Jihoon's story wasn't over yet, Vicious Spirits focuses more on Somin and Junu's journey. And I think, at the end, these two characters were exactly what they both needed; they both saw - and understood - each other's struggles, but they also realized no one but them could fix their problems.
I think realizing that was really important for their character arcs - and eventually their relationship. The enemies-to-lovers trope was really well done and I was happy that they ended up together (though I already knew it would happen), especially after everything they've been through.
I'm also glad we got to see more of Junu's past; I could understand the way he acted after he pretty much lost everyone he loved in just a few days. He was a lonely soul wandering the earth, wanting and needing to be loved by someone and to love them in return. In that sense, I think he also needed someone who would always fight for him, no matter what, and that's why Somin was the one for him.
Not only did we see more of Gumiho and Dokkaebi, but jeoseung saja were introduced too - known as reapers in the Korean mythology. It was really interesting to delve more into other mythical creatures I honestly didn't know existed (which makes sense, but anyway).
There was one thing, however, that I didn't completely understand. I already mentioned it in my review of Wicked Fox: Changwan. Again, he had one or two moments in the book and I just felt like his character didn't add anything to the plot. It would have been better if he hadn't existed in the beginning, because then the plot would have been the exact same. It just was such a waste of character to me
Overall, I really loved Vicious Spirits and I can already see myself rereading this duology somewhere in the future lol. This duology certainly deserves more attention than it gets; it's not only about the romance, but also about really intriguing Korean mythology (and I really would like to know more about it).
[EDIT]: Damn, I knew I was typing a lot but then I posted it and I was like that's a lot of space lmao. Anyway, I hope it all makes sense! c: