Lyric discussion by starlitecascade 

I love this song. It's so sad, even though it's called Smile. Hah.

This really tugs on my heart-strings. It's like.. she's asking him to do anything but smile. Something's not right, so she's keeping her smile and leaving for some reason because she believes there's nothing left. But if she only sees him smile, then she knows she won't be able to leave anymore, he'll "steal away her soul" and she'll realise she's actually leaving.

Just my take, when you put it into a 'relationship' point of view.. or my situation at that. Lol.

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