As your question “why the sales quantity of DVD vol.1-6 and BRD vol.1-3 are all zero. Is this correct?”
Yes, that sales quantity in the report is correct because the sale of DVD and BRD are not very good in Thai market and this can be sold with Toloveru’s fans only.
In addition, it is an old story and not a new released at the moment, so there is a decrease in popularity on the market.
Thus, there will be dropped sales and returned a lot of discs from the distributors.