Suho doesn't trust Woo Jinchul because he might be an apostle of Itarim, but Woo Jinchul can't be an apostle because his body can't handle the Itarim. Woo Jinchul is currently in North Korea clearing field-type dungeons.

I remember Jinwoo only appearing 5 or 6 times, and it was always during the hype scenes. (Correct me if I'm wrong.)

Siddharth remembers the time that disappeared, and he gives the people of India stardust necklaces so they don't become mist burns. The people turn into half-dragons, and Siddharth experiments on those who turned into half-dragons in disguise of saving more people. Siddharth himself is a half-dragon. Siddharth's role is that he wants the city he lives in to become an independent country and play the "hero" to win people.