Any banks that accept old U.S. bills?

I’m living in Korea now, I have a couple of U.S. hundred dollar bills that I brought when I moved from Dallas.

Every bank in Korea that I’ve been to says they won’t accept it because it’s not the newer bills with the blue stripe.

Do you know anywhere it would be accepted to exchange into won?

They are 100% real just not new…didn’t think I’d have this issue.