Ann: Collaboration with Little Green Pharma Ltd, page-139

Among them, the "SK-II Blemish Pen", which was exclusively launched by Tmall Black Box, has reached nearly 20,000 sales per day,

you might want to reset your expectations. Its currently running at about 60 units per day. That's to be expected given there has been almost zero promotion for this product. "Word of mouth" is not a marketing campaign. SK-II has not fully launched this product yet and I have no idea why.