"아직 난 모르지 않아요"
모르다 is the opposite meaning of "to know", but i heard the tittle Korean song ""아직 난 모르지 않아요"

so why 지 않다 can be combined with 모르다 in that case and what does it mean?

Question

"아직 난 모르지 않아요"
모르다 is the opposite meaning of "to know", but i heard the tittle Korean song ""아직 난 모르지 않아요"

so why 지 않다 can be combined with  모르다  in that case and what does it mean?

Answer

tks so much, perhaps i was typing incorrect, that should be 모르잖아요, a kind of exclaimation in Korean

Answer

Original text is '아직 난 모르잖아요.'
'모르잖아요' is short form of ' 모르지 않아요'
But the meaning is totally different.

모르지 않아요 = 알아요. ( I know) : typical negation sentence. 
모르잖아요     = 몰라요  ( I don't know @.@)

ex) 춥지 않아요: It is  not cold. 춥잖아요 It is cold.
      맵지 않아요: It is not spicy. 맵잖아요 It is spicy.

When we explain the state and propose a idea or express  dissatisfaction 
in following sentence, koreans say like that..
ex) 비가 많이 오잖아요. (그러니까) 공원에 가지 말아요. 
     이 옷은 너무 크잖아요. (그러니까) 사이즈가 다른 옷으로 바꿔주세요.