I am from south China (where dialect has no retrofex pronunciation as Japanese), but got my bachelor degree in the Northeast China, so I know how to learn standard Chinese when you are not good at retroflex Pronunciation.
本人南方人，本科四年在大连上的大学，练就了一口标准的普通话。故在小孩儿发音矫正等方面有着独到的经验。