1. Is there GST (or a similar tax) in Hong Kong?

There is no GST (or a similar tax) in Hong Kong.

2. Are there any taxes applicable if we sell into Hong Kong since there are no GST (or a similar tax) in Hong Kong? 

There are no GST or customs duty on importation of goods into Hong Kong. 

Jade E-Services Singapore Pte. Ltd. (“ZALORA Singapore”) manages and operates the Hong Kong platform. As the said entity is GST-registered in Singapore, all fees charged to you for selling on the Hong Kong platform will be subject to Singapore GST rules. In general, marketplace and related fees are subject zero-rated, i.e., 0%, and ZALORA Singapore will issue a Tax Invoice accordingly.