This is a possible concise summary:
The text is a transcript of a video where a man named Jang Sungkyu works part-time at Subway, a sandwich shop. He learns how to wash, slice, and prepare the ingredients, how to make sandwiches according to the customers' preferences, and how to clean the tables. He also chats with his co-workers and customers, making jokes and asking questions. He finds the job enjoyable but tiring, and compares it to a sensory play for babies. He ends the video with an acrostic poem using the word 'subway'.
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