유리아이 is the Korean name of the song 'Lost in Love' by Taeyeon and Tiffany of Girls' Generation.

I know that *유리 琉璃* means *glass*, and I know that *아이* means *child*. However, when put together, *Glass Child* doesn't make much sense. Is it some kind of colloquialism or idiom in Korean? What does it actually mean?