What would you do if the cashier at your local convenience store turned out to be a member of MONSTA X?

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The boys tested this question out recently by volunteering as surprise part-time workers at convenience store chain 'GS25'! For elementary school or middle school kids, recognizing MONSTA X might be a piece of cake, but what about 9-to-5 professionals or senior citizens? 

Watch, and have a good laugh above!