Does the word "one" in this scenario indicates that day's morning was particularly hot compare to other days?
You'll notice that many stories start with "one day" or "once upon a time." These expressions basically mean "at a particular but unspecified time in the past." The information that it provides you is that the following story happened at a point in the past, but does not tell you exactly when. "Very hot morning" is just to provide additional information here, and is not intended to emphasize how hot the weather that day was compared to other days. Ex: Once upon a time, there lived a boy with a lightning-shaped scar on his forehead. Ex: One day I forgot to do my homework and got scolded by the teacher.
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