In Mask, Lao Hao was killed because of his broken mouth. Lao Hao in the play is an ordinary driver, but as a driver of some special people, he must know what to say and what not to say. Obviously, Lao Hao didn't do this. Lao Hao talks a lot and always inadvertently says something he shouldn't say. This behavior makes people full of vigilance against him. Later, Lao Hao did not know why he appeared in the wrong place and was killed.