After investing so much money, it is reasonable to say that you should be able to learn something, and you should be able to learn something; The easiest way is to wait for your sister to come back from school. You can test her and let her get something. If not, there are only two situations. First, your sister is not the material, but she will learn something. Second, Wang Fenglin is a liar.
Finally; Don't go to the teacher blindly, the key is to see if there is "fate" in your eight characters; The so-called predestination is whether you are suitable to learn this thing ... A real teacher will not accept a person who has no predestination as an apprentice, and at most he will recognize you as a rich boy and will teach you something. God, I'm telling the truth again.