<Tr> <Th_colspan="2"> "Only I Didn't Know" </Th> </Tr> <Tr> <Th_colspan="2"> Single by IU </Th> </Tr> <Tr> <Th_colspan="2"> from the album I U </Th> </Tr> <Tr> <Th> B - side </Th> <Td> "Cruel Fairytale" </Td> </Tr>

Iu the story only i didn't know meaning