How I understood it...

victoria October 11, 2020 5:39 pm

Obviously this is just a guess because it is a bit confusing, but my understanding is that because Gyeong Joon is Cain's door, the Doctor was using the power of his soul to help heal Cain. I think Joon's soul was being destroyed through this process which was why he was disappearing, but Cain pulled him through and forced himself into consciousness quicker so that Joon's soul wouldn't be completely destroyed by the process of fully removing the bullet - the dr mentioned only removing half of it.

Responses
    gordon08 October 11, 2020 5:42 pm

    Thank you so much for this