Sid of Dear Door - Who or what is he?I decided to make a few posts on Dear Door, on Sid especially,

Sid of Dear Door - Who or what is he?

I decided to make a few posts on Dear Door, on Sid especially, and this is the one I will start with.

Now, first of all: I can’t read Korean, but use several translation tools for the chapters which are not yet available in English. Thus, part of this is interpretation, yet with the knowledge of what happens until the most recent Korean chapters. I will leave links to support the author at the end.

SPOILERS AHEAD!!!!!!

Sid was a very low class-demon (there are classes). Though he was not supposed to, he developed some kind of self-awareness and curiosity, and thus wanted to explore the light shining in from above and the noises he kept hearing. 

Once he had climbed up there, he was snatched by some higher-class monsters/demons, who wanted to feast on him and tore him apart. Young Cain somehow happened to witness that and stopped them. He gave Sid a new body, some powers and a new life, and named him Sid (or rather ‘Seed’ in Korean).

In general, as a demon to survive, sustain your Mana or gain strength, you need to feast on other demons. This can be lower/smaller ones, but they won’t really satisfy and you’d need a lot. So it better be demons of the same size/stature.

Sid had to do this as well. He had to sustain a “higher-class body and Mana”, but only had the mental strength of a lower-class demon. Therefore, he could not digest the ones he had to feast on. They ended up cluttering inside him, became parasitic and developed some kind of control over him.

Those parasites have a very good idea of what they want - and first of all they want to stay alive. This means, of course, that they want Sid to stay alive.

However, it does not mean, that they want what is best for Sid or what Sid wishes for. They do not care about what is best for Sid, about how he feels or what he wants. Rather they have him unfeeling at all, because like that it is easiest for them to know what’s going on and what he’s doing next. Because of this, Sid often has to lie about his true plans (see below).

Furthermore, they fear of Sid having to feast on more demons for his strength, because they know they will also just end up inside him and that it’s getting “too full” in there.

Sid is in a constant struggle against them now. He wants to get rid of them but does not know how. He wants to quiet them down, but this is a trick he is still trying to learn and whenever he accomplishes it, it won’t last long and takes a lot of his strength.

They threaten to take control over him and seem to actually have the ability to do so. They talk to him constantly; try to influence him and think he is behaving more and more suspiciously. This is a bit like Sid was being schizophrenic, only that his true self is always aware of what is happening all the time and is trying to maintain control.

He can’t let those demons inside him know what he really is planning for Cain or what he feels about Jin because they will stop him, work against him or take control fully.

Tl;dr:Sid got his body from Cain and had to feast on other demons to remain alive. Those ended up as parasites in his body who try to control him. He has to lie to them (and thereby others) to conceal from them what he truly is planning, as they will try to stop him, otherwise.

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