I think the costume of part 1 is different than part 2 is because of the time setting.
I'm watching Zu Mountain Saga. And Zu Mountain Saga takes place 100 years after Eddie Kwan and the two girls froze in that mountain.
Therefore, the whole costume in The Gods and Demons of Zu Mountain seem a bit "primative" because it came 100 years before the time of The Zu Mountain Saga.
I'm watching episode 5 of Zu Mountain Saga, and I really love the BGM which is basically the instrumental music of the theme song. I just wished TVB had great BGM like this now.
Ekin's Shek Sheng character is like Frankenstein's creature. So innocent with good chances of being good or bad.
This is my first time watching it, I had the chance to see the prequel years ago, but never got the chance to see the sequel.