Bishutang has no direct relationship with Watsons.
Bisutang is a brand registered by Guangzhou Oupei Cosmetics Co., Ltd., and Watsons is a retail brand of Watsons Trademark Co., Ltd. Watsons applied for the trademark on January 17, 1981, and completed the registration on November 30, 1982.
In general, Watsons is a retail brand with a long history, while Bisutang is an independent skin care brand and has no direct relationship with Watsons.