Chapter 1: Sometimes we know we have enough but we feel empty anyway.
The way Donghwoo realized "It was as if a part of me had gone, but I didn’t notice until it returned" it's like what he has - friends, family better than his biological parents, occasional relationships and that's what can make him opposite of empty.

However, some things can make people turn into cocoons and to make them loose out of their sight what they have.

That's what I think that happened to Donghwoo - even through he's chatty with Niel, his' brother's cold side when he's gone is probably affecting him a lot.

At least that's what I think.

(wow this is pretty longass comment, isn't it? >^<)

Chapter 1: Wow. This is merely a drabble, yet, it managed to take my breath away.
You have quite the gift, love.