My Sylus Myth Theory

When Sylus and MC exchanged half of their soul with each other im sure they also gained the power to communicate in "Dreams"

I will remind you that in No Defense Zone Sylus knew MC dream because he was inside of it. And why im sure about this?

Since they shared half of their souls they can be and communicate though "dreams"

They had their first kiss and legit happy moment on the flowers correct?

Now take a closer look tothis quotes

- "as long as the eye can see but only for one person" (Only MC can enter there)
- "here only you and this flowers can touch me" ( a "world" just for them both where they can be together and interact without other persons to bore them)
- "as long the eye can see" ( reference to the power in his eye )

The place Sylus choose to die is? Exactly the flowers ..if it was only a dream did you really tough he would choose this place?
The place they kissed?

Now take a look at this:

When they both asked what which one dreamed about none of them answered.
But Sylus was aware
It's a "world" created with half of their souls and power than connect them both eternally

- - - - - - - - It was a shared reality within their souls - - - - - - - -

Now for the question if he died

Since the curse was lifted and fate changed MC cursed Sylus. His soul would never die or fade away

When her horns grew she was rebirth ( power to be reborn countless times) and sylus was also reborn somewhere

"when a dragon grows their owns it means a rebirth" - Sylus quote

In Chinese stories ( correct me if wrong) when the lover that survive curses the other, it looks for fragments that were reborn of his loved one and completes it.

So i guess the reason they both are alive and sylus cannot die its because they not only share half of their souls but also the curse MC did that day.

And now because of it Sylus cannot die and she can be reborn.