Transprant shader problem

Here is the problem, I find some ghost shadow of my render that should be totally transparent, I have no idea why it has some weird shadow

Here is the simple transparent shader.

Interestingly, maybe more samples will solve the problem. However, I do not understand why a shader when there should be nothing. For real glass you need another shader.

Just figure it out, i need to turn the color all the way up to make it totally transprant.
In mine setting, the color is not pure white.

Ahh, I remember something like that, but why not just hide the object?

Cause hiding it will let the outer light get in and ruin the scene.

now i got it, cheers.

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