I dreamed that someone cut my hand with a knife.

This has something to do with your sleeping position. Your hand must have been under a lot of pressure when you were sleeping, so you felt someone scratching your hand with a knife in your dream, and then you woke up feeling that your right hand was itchy, numb and hot.

It's easy to explain when I see your supplement.

You must have fallen in love with a boy in your life, but this boy treats you as an outsider (maybe a little different in language ...), so you will dream of becoming a Korean and meeting a handsome Korean star. You replaced the boy you secretly love in your life with this Korean star, which shows that you really want to get close to this boy and communicate with him. But you may be afraid that this boy will refuse to be cold to you, so you dream that the actor hurt your hand with a knife. So you want to quit school to escape this embarrassing situation. Dreaming is that you really want to approach him and confess to him, but if he refuses, you are willing to drop out of school.