You don't have to say anything to know your last name.

Secondly, his technique should be similar to some card tricks.

If you pick up a card with your last name written on it, he can roughly judge what your last name is. One ninth.

Then what finger measurement is just a cover for fraud, and it should be calculated mainly according to people's psychology. In addition, the landlord should pay attention to where his eyes look and whether the surnames on the cards are tricky, such as some extremely uncommon surnames and compound surnames.

If you talk to Liu Qian, he must know this principle. This is where he grew up and became famous.

I hope the landlord will adopt it. -_~