Pick a card at random. Why can you guess?

These cards are arranged in a specific order. After drawing a card, this person can just look at the card above or below and know what you are drawing. Generally, they don't repeat the performance, so it is convenient to take the above cards and hide them in their palms or other places.

This is one way. Another shameless method that is not magic is to use a card with a specific mark on the back, and you can know the face of the card by looking at the back. It is said that guessing cards is to prevent you from thinking about the back of the cards.