Why does Sister Tao have so many star guest appearances?

There are many star cameos in Sister Tao, including Sammo Hung and Tsui Hark. These big-name cameos are basically for the sake of Xu Anhua or Andy Lau's face. You can see these big names filming in the documentary. Another scene in Sister Tao is the movie premiere, so it's really like the movie premiere. People from all walks of life have it, such as Zou Wenhuai, Ning Hao, Roland and Angelababy. Andy Lau, the boss of filming, doesn't talk about money. Besides starring, Andy Lau is also one of the investors in the film. His 30-year mother-child relationship with Ye Dexian and his appreciation of Xu Anhua have become topics.