education (47) 2 Prepare and expect
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Me: A kid may listen to his mom.  However,  a kid seldom listen to a stranger. 
John: Take a look, https://kamchihau.blogspot.com/2022/08/httpskamchihau_62.html?m=1. Miss Jeng and Mr. Leung are coincidentally on duty and free. And,  before that moment,  they are ignorant of that me and my father is on the black list.
Me: It is unprepared and unexpected to them.  
John: In their eyes,  Kelvin is just a stranger.  How would a kid listen to a stranger ? They rather listen to the hospital who are their wet nurse.
Me: What does wet nurse mean ?
John : The hospital pay them salary. 
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Kelvin : Later, I will use the poison to kill John's father. I know that in you guys' eyes,  I'm an aliens. However,  if I promise that I will teach you guys the hacking techniques and teach you guys how to use the poison, would you guys consider listening to me?
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Miss Jeng : In this case, I may consider it. 
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Kelvin: Good. After I kill John's father, you declare loudily, "Oh! A class start. ".
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Miss Jeng : What sort of class? 
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Kelvin : I teach you guys how to hack the telecom.  I teach you guys how to use the poison. 
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Mr. Leung : What do I do ?
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Kelvin : You pretend to be innocent and make an excuse and say to John, "I am a low-level spy.  I have low authority.  I try to help you.  However, I fail.".
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Mr. Leung : Why should I say that?
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Kelvin : I'm a alien. You won't listen to me. I know that. However,  you are a low-level spy. You are not guilty, and, at the same time,  you learn the hacking techniques and you learn how to use the poison.  Isn't it worthy ?
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Mr. Leung : Yes,. You are correct. 
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John :Are they acting in a drama ?
Me: No, . A drama must include a rehearsal.  It's unprepared and unexpected to them. How can it be a drama ?
John : Then, what is it ?
Me: It's an ad hoc command.