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For the ordinary audience, to laugh in a happy scene and to cry in a sad one seems only natural. But what they don't know is that these laughs and cries are a "choice," and there are a thousand ways to laugh and a thousand ways to cry. It's the countless rehearsals that decide which one will finally be presented on stage. Many mistake natural facial expressions and genuine emotions for acting, but that's just the basic skill of an actor. The real test of skill is in the choices different actors make under the same plot, and that's the reason why Shakespeare's and other classic plays never fade.
The reason Zhang Ming asked Xia Yuting about her familiarity with Kunlun was firstly to see if she had come prepared, which meant how much she valued this opportunity, and secondly, he wanted to assess Xia Yuting's control over the emotions within Kunlun.