zěn me shuō ne
Why is that?; How come?
怎
zěn
how
么
me
suffix, used to form interrogative 什麼|什么[shen2 me5], what?, indefinite 這麼|这么[zhe4 me5] thus, etc
说
shuō
to speak; to talk; to say
呢
ne
particle indicating that a previously asked question is to be applied to the preceding word ("What about ...?", "And ...?")