The opposite of unconcerned is concerned, or worried.
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Answer:
Short Story Of a cleaner
Explanation:
One day a cleaner had a mopping job, when he got to the location of the cleaning, he started his work without thinking of how and where to end it.
When he got to the last part of the room, he remembered he was at a corner, he then discovered there's was no way of getting out without messing up his work of many hours.
He then sighed and said to himself, "Don't put the cart before the horse".
The Climax comes after it