If you want an almost perfect story to answer most of the questions that you had while watching part 1/S1, then don't expect too much. For me personally, the story was okay. There were a few issues. I know people had different opinions and some didn't like it. That's why I'm writing this review to show my perspective. Also note, that I'm going to use pt1-2/s1-2 interchangeably.

These are the issues I encountered regarding the stories & characters:
#1) I don't know if the subtitles were mistranslated, but Master Lee stated that Naksu was not a soul shifter which makes no sense. If it wasn't an incorrect translation, that means there's a flaw in the story somewhere. In S1, she performed the AOS but she had a different target & Bu yeon interfered in the process, leading Naksu's soul to go to Bu yeon's body. People who fail to soul shift also have a blue mark in their original body ( Naksu's original body also had one). In S1, by the temple, Gil joo(Jin mu's assistant) tried to shift souls in Jang uk's body but failed & his soul went back to his original body and he ran wild. In the end of S1, where Naku lost control with the bell & was easily controlled by Jin Mu because he gave his energy to her. She also got petrified, a characteristic of soul shifters.

#2) Jin Mu. I feel like they dragged Jin Mu for too long. I understand that he's the main villain, but there were so many occasions where he could've been rid of both in Pt1 &Pt2. It seems to me they came up with every reason for him to survive just so he could be the villain who brings out the fire bird, the source of chaos 200 years ago. Also Jin Mu's death in the fire with other mages didn't feel good enough. Feel like he should've suffered more.

#3) The fire bird. They made it sound like a huge issue, but it didn't seem like one. They never mentioned it pt 1 that the fire bird was the source of chaos. I feel like it should've been mentioned there & not near the end of pt2? Another thing is if the person of the king's star is able to kill the bird, why didn't master seo gyeong do that 200 years ago with jin seolran. Why did it have to be sealed instead? They made it look effortless to kill that bird. In just a minute, Jang Uk killed it without breaking a sweat. That's something that was never explained.

#4) A lot of things felt rushed. If they wanted to end this in 10 episodes, the amnesia shouldn't have been dragged to like episode 8.

#5) The bells. I hated that they introduced it in S1 (it felt unnecessary), but I don't recall it ever being shown to be used again in Part 2. They mentioned it for like 10 minutes just so Naksu would feel less guilty about her killing people.

What I don't see as issues:
1- FL change. If you cannot handle changes and watch a new face or you cannot accept someone new to play a role since you're familiarized with someone else's face for a character, then don't watch it. My honest opinion is that for the character that was shown in S2 for Buyeon/Cho Yeong, I don't see JSM pulling it off. I could be wrong. I liked Pt1/S1 & JSM, but another thing is that we were already shown GYJ's face as Naksu in pt1/S1. It makes sense to use GYJ face in pt2/s2. It may not be a plausible reason, but it was given in the start of pt2/s2. Before, Buyeon kept Naksu's energy under control to prevent her from going crazy and being petrified. However, when Naksu's energy took over with Jin Mu's energy, Buyeon no longer had control. In order to save her life & reverse the petrification, Master Lee stated that they had to use Naksu's energy and soul, therefore Buyeon's body would have the appearance of Naksu's real body.


2- FL's character. I'll admit I'm into strong FL characters myself, but I don't mind the type of FL character portrayed for S2 because it wasn't a frustrating character (most writers turn females into weak, whiny, jealous, immature, dumb characters which pisses me off the most). I, like others, expected her to go back to her usual self, the badass Naksu who kicked ass. When things didn't go as expected, I understood why they chose it that way and I didn't mind it. It actually seemed better. People (and I) forgot that Naksu was the identity of an assassin. She was used by Jin Mu & killed a lot of people & even stabbed the man she loved (although I really hated that part it was the most stupidest thing writers chose to do but that's for S1). It would make sense for her to want to let go of that identity because it was related to her vengeance and dark past. Additionally, Naksu's reputation would never be cleared in the eyes of the people. You cannot convince an entire country that she was a victim instead and attempting to do so would cause problems and further chaos. So letting go of the identity of Naksu, the elite shadow assassin who kills high level mages, was better for her. When her and Jang Uk were getting married, she said she wanted to use her birth name Cho Yeong. We don't know how Cho Yeong would grow up if she did not suffer that trauma. I'm assuming with the trauma gone, she would act similarly to how she was when she had amnesia. Basically the writers saying that if she hadn't suffered she would be like other female characters in the drama like Jin Choyeon or Yoon ok. Yes, one thing maybe they could've done differently is show a physically strong FL regardless of whether there is trauma or not. For example, in the end, Cho Yeong decides that she would be willing to train her mage powers to Chisu level again to help people. Completely different than being an assassin. But she's using her divine powers of Buyeon to help people instead in the ending that they showed us.

Damsel in distress. I partially agree with damsel distress but she's not weak (maybe physically but not mentally) or dumb. When she was trying to get the jade back, she didn't blindly follow the guy into the trap leading to Jin mu. She used her ability to see energy to follow the correct person (So yi). She also didn't inhale the powder that was meant to knock her unconscious & used her brain to jump in water to avoid it. Seo Yul did help her so yes it's partially damsel in distress. In order to prevent the Unanimous Assembly from taking out Jang Uk's ice stone she gave her being a soul shifter as a reason as to why his ice stone cannot be removed. She knew how to respond in times of stress & didn't make foolish decisions. She also got her revenge on Jin Mu (which the writers ruined by keeping him alive till the end).

What I watched this part2 for & liked:
- The continuation of the slight bromance between CP & Jang Uk. This part included a turtle.
- Maidservant Kim & Park Jin.
- Master Lee.
- The romance between Jang Uk & Bu yeon/Cho Yeong. Part 1 felt more of a platonic relationship & more master-pupil.