
I haven't finished yet, but for what i know, he probably couldn't 'come' into earth yet because he couldn't find human host. (Rulers and monarch use human bodies as host) dragon monarch is equally as powerful as shadow monarch, the only reason why shadow monach has a host bc architect offer him a help

Spoiler
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Well, after killing monarch of plague, jinwoo accidentally lowered his guard, making monarch of beast and frost attacked him continously. His hp went 0 and died. Then he met ashborn in world of death, they talked, ashborn showed him what actually happened in the past. Ashborn gave jinwoo a choice wether to continue live with him in world of death of continue fighting in earth. Jinwoo choose the later, then he gained all shadow monarch's power and eventually revived(?) after became the new shadow monarch.
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Lmfao i was so confused when jinwoo died I thought it was a joke, turned out he really died LDKJDDNEJ