Stars are human too, and they definitely know their own shortcomings. Thus, there are all kinds of "protests too vehemently" to cover up these shortcomings. Let's have a discussion. I'll start first.
Feng Xiaogang: The most obvious is that buck-toothed mouth. Thankfully, director Xiaogang probably knows well about his mug, so in occasions where director Feng is not talking or being secretly photographed, he often has his lips closed. It makes people feel like he's holding back. To be honest, I really want to go up there and pry his mouth open.