Everyone has things they cannot accomplish, but they still like to show off, and Yun Qian is no different.
For instance, she cannot eat spicy food, yet she insists on having one when Xu Chang'an is eating wontons...
There are many similar things.
She seems to always overestimate her abilities.
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Yun Qian usually has a lot of confidence when facing certain things, like being able to say she only has a quarter-hour, so she won't delay important matters.
But in different circumstances, this confidence loses its effect.
For example, Xu Chang'an has much respect for Yun Qian, but everyone has a limit. He often keeps the word "restraint" on his lips, like a diligent old gentleman teaching the lady to be restrained...
Obviously, Yun Qian is not a good student. Not only does she fail to learn, but she turns around to teach the gentleman how to do things, even wanting to define the meaning of "restraint" herself.