Calling people steamed buns means knowing people's faces but not their hearts. A steamed stuffed bun always doesn't know what its stuffing is before eating, and always thinks that its inside should be the same as its surface, but it is not what it looks like. In fact, it can also express derogatory meaning or justice, depending on what is inside him. There is also a saying that people are called steamed buns, which means they look the same, and sometimes they mean dull, depending on your understanding.