I'm going to Seoul for the first time soon! Any must-try beauty experiences you'd recommend?

Hi everyone! I'm Peihan from Taiwan. I'm finally flying to Seoul next month, and I'm super excited! I've always wanted to experience Korean beauty culture firsthand, so I've decided to explore it properly this time.

I mainly want to try Korean skincare experiences, like those supposedly popular deep cleansing or moisturizing treatments. I'm also curious about the local beauty clinic area (I know there are a few concentrated areas), but to be honest, I'm not quite sure which one to choose, or what my budget should be. Could anyone share their skincare experiences in Seoul? Are there any differences?

Also, I'd like to ask if there are any must-buy Korean skincare brands? I know they're available in Taiwan, but will there be any differences if I buy them locally? Please share your experiences and suggestions, thank you!