
Beru is originally evil so ... I guess there's a chance that he might turn against Jinwoo( ̄∇ ̄")
But i have a theory that the power Jinwoo possed now is in fact borrowed and the chapter of his fight with the architect makes it feels like that Jinwoo is just a shell ,a vessel for the Shadow King to be reborn into ( ̄へ ̄)
So i don't know if mah boi Jinwoo gonna be okay but i hope he will be ╥﹏╥

Your theory is actually true, Jinwoo was supposedly the Shadow king's vessel, and that part where he woke up from the dream it should've been the Shadow Kings consciousness that's inside Jinwoo's body, that's why the architect was shocked of how things turned out. But to give you assurance that Jinwoo will be alright, the moment he woke up as Jinwoo and not the Shadow King, was a choice the Shadow King chose, so instead of being reborn he chose to give everything to Jinwoo and that is the black heart. The black heart signifies the Shadow King and it's power, in other words Jinwoo is now the real Shadow king (although he is yet to obtain the full power for now)
I can't stop thinking about the undead army that was on his side that his shadow ant killed off, and the warning from the healer regarding his power. I'm worried the shadow ant is in fact evil. The undead seemed like the good guys somehow...