Hello Pelin,
The only difference here is the word 'angry' and 'upset'. 'Angry' has only one meaning whereas 'upset' could mean that the person is 'worried', 'unhappy', or 'angry'.
Hope that helps.
21 ตุลาคม 2014
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I agree with The IELTS Tutor. They mean the same in certain contexts since upset can also mean worried or unhappy. :)