This is a classic game BlackJack.
Black Jack: The points of two cards in a hand add up to a total of 21 points (such as an A card and a flower card or a 10-point card).
Take a card (HIT): Take another card. The player can ask for cards as long as the sum of the cards in his hand is less than 21 points. The dealer is forced to take cards or chooses to take cards according to the rules.
Stand: No more cards will be taken. In any case, the player may choose to stop asking for cards.