Hi,
I'm from KL. I'm going to visit Macau, ShenZhen and Hong Kong by this coming December.
I'll be going from KL to Macau, then from Macau to ShenZhen and from Shenzhen to HK, and last back to KL from HK.
KL - Macau - ShenZhen - HK - KL.
I'm wondering, should i apply a single entry of Visa to enter Shenzhen from Macau only? Or do i need to apply another visa to enter HK as well?

Thank you.