How can I use a Korean SIM card in my US iPhone?

Hi Fellas. My name is Yoonwon Lee from South Korea. Here's a issue that I want to discuss with you guys. I just bought my new Iphone in the US. But I have some emergency situation that I have to use my korean number in my new iphone in the US. However, iPhones manufactured in the US no longer have SIM cards and are all replaced with eSIMs. However, the number I used in Korea has a SIM card. However, there is no space for a SIM card in the new phone I just purchased. So I am trying to make an eSIM with the carrier of the number I used in Korea, but since I bought the phone in the US, it seems that this device does not allow esims from other countries. To make the solutions, I think I will have to visit an Apple store in person, but can store employees be able to solve this problem?

[Re-Titled by Moderator]