In the name of Allah, the most Gracious, the most Merciful,
Do you know how the word "won" is pronounced?
If pronounced in a way similar to that of the word "one", it becomes the past tense of the verb win.
If pronounced in a way similar to that of the word "worn" but without the "r", it becomes the currency for South Korea.
Now try saying "I won one won!". That should help you to remember the pronounciations of the word "won".
Pronounciation for won (past tense of win) at www.howjsay.com
Pronounciation for worn at www.howjsay.com
Allah knows best.