Great job, Rose. Please review the edits below :)

Hello, Jun. This is Youngsook speaking.
I mae a mistake that involves you. You may be angry at me, but I'll tell you frankly.
You know that I borrowed a pair of pants from you to go to Sunhee's birthday party.
Last night I wore them to the party.
When I was talking to Sunhee with a glass of juice, someone was walking backward and hit me.
I was shocked. I dropped the glass, and the pants were stained by the juice.
I know that you cherish your clothes, so I will try to compensate you for the damage.
I'll pay you the cost of the clothes, so you can buy the same ones.
Or I'll take them to the dry cleaners to remove the stains.
It's up tp you.
I'm so sorry. Please don't be angry.