This is my 300th confession

The female protagonist decides to confess to her long-time crush, Jungkook, in order to end her unrequited love that has lasted for a long time. However, she is rejected. The female protagonist wakes up from a depressed sleep. But time has gone back to before she confessed..? A message appears to her like that [※ Urgent! Successfully confess. If you fail, you will be trapped in this world forever!]