Spoiler Free Part:
In Summary: Plot was messy with some plot holes I can't ignore with my drama intuition built from years of watching and observing story line written by others. Some part of me regrets going on this journey itself (cause it is quite generic and doesn't compare to how I felt for Goblin) but I am somewhat at least still happy for another part of me which have gone down this journey, no matter how much flaws I noticed. TNT was very Goblin-esque no doubt. The brotherhood, the ML and FL relationship and the supernatural. I still enjoyed it a lot. The cast's acting is great. ML and FL actually did well portraying their character. Side Characters are some individuals that I care more than I expected. OST is amazing as usual such as Moonlight Ballad by Lynn and Leaning on you by Sung Shi Kyung. The instrumentals such as Lightning bugs and parting at the three rive crossing by Hong Dae Sung is magical.. CGI wasn't overdone and appropriate. The would shot some scene beautifully (other than having black screen be the transitioning scene which I don't think was really smooth or a good choice at times). Overall I believe they did many things well other than the core part of the story writing and direction choices taken.

Spoiler Part:
The ep 16 ending: so basically the idea that you need to sacrifice something, to get something. That to me is a more tragic message than an inspiring one. I cried deeply for the lost of lee rang at the end rather than lee yeon himself. The ending about how lee yeon could potentially be a gumiho again does create confusion but I want to believe it is more of a fanservice. The fact that in the end, they reincarnated so early in the same lifetime also does takeaway the impact I had (as compared to HDL where the they did show the reincarnation happening but it is in a future lifetime (fantasy of KCS) which is a stronger effect). They gave us happier moments between the leads as well as to a certain degree, the relationship between granny and gatekeeper and little kid (dog) with yoori (though there is something missing in terms of the 2 friends of FL as well as the possibility that the little kid could be friend with lee rang in kid form). It's alot of back and forth in terms of the flow. I also personally didn't like the aspect about how many people died for unjust reason just because the imoogi spread the plague or cause people to suicide. The impact of those death felt meaningless to me, almost as if they are just numbers because the FL didn't show the appropriate reaction to those (other than to her friends).