Koreans are too old to speak English.
That's why they were considerate so that they could communicate in Korean, but it's foolish to think that this is favoritism only for Koreans.
You are basically people who can use English,

so communication is not a problem, but they have to communicate their opinions by using a translator.
However, it is not delivered correctly because the translator is not perfect.
Therefore, using these BANDs, it suggested a simple way to convey opinions.