Zodo time and yuzuki grew up together, by yuzuki regarded as 'brother' (at that time zodo body of ling ah did not awaken) people,

He and yuzuki is very close (not lovers), he is in yuzuki helpless time to help him, love and care for him, just like a biological brother, yuzuki to zodo has a deep feelings for him and completely treats him as his big brother, and since Yuuki is an orphan, he has even deeper feelings for Sodo.

But

LZ also knows

Ling Ya won't be that affectionate.

Breaking yuki cyan's heart.

All in all, Zodo is a very important 'loved one' in Yuki's life, and I personally think it's because of his existence, his love and encouragement that we have such an understanding, gentle, beautiful (asshole this has nothing to do with Zodo = ==) Yuki, and it is because of that that Yuki, when he saw Zodo, wanted to kill him, and that's what he did. (泠呀) want to kill their own will be so sad

So, in the heart of Yuuki, Zodo really is 'big brother' Oh, is a loved one such a warm hearted existence