What is the name of the game in Korean Love Letters, in which a row of people squat down and then stand up according to the host's command, and what are the rules of the game~! Urgent need~~~

The name is in Korean, and the translation seems to be "squatting and standing." The rule is that people stand in a row, the host says the number, and the number reported by the host is less than or equal to the number of people squatting. For example, if the host says 1, one of the squatting people will stand up, and if he says 2, two people will stand up and go down the wheel, but many people will not be able to react. This tests people's concentration and reaction, and of course physical strength.