Change of flight tickets

Hiii I know this sounds ridiculous to some people but I'm funding to change my flight as I have a concert that I really want to attend and its just a day after my original flight.

I'm currently a foreign student studying in Korea with a scholarship. I'm able to be here because of the scholarship and without that, I won't be able to come as my family is having a tight hand with 2 siblings studying in local universities.

The flight was booked a long time ago and the concert news was only been released last 2 days. I really wanted to attend the concert as I've missed the previous one and I want to give myself the reward. I've been studying hard and doing free translations to others so I do think I deserve this.

I've gotten the permission to purchase the concert tickets but the change of flight tickets is burdening me. I hope there's people who're willing to help me with this. I'll also be a great birthday present to me as my birthday is a few days after the concert. Thank you in advance.