Not realistic at all . A Korean man who is able to speak that SUPER FLUENT ENGLISH . Using all the senses of humor , slang and culturally assimilated would not run a convenient store, if you ever been to Stores run by Koreans , like convenient , liquour and dry cleaner , is mostly ran by 1st gen. Korean. They definitely speak enough english to see their customers. But not that fluent level as this man does.