Going to Seoul soon! Any must-try skincare experiences you'd recommend?

Hi everyone, I'm Tiantian, and I'm flying to Seoul next month! I'm super excited! Although I use quite a few Korean beauty products regularly, I've never actually been to Korea to experience the local beauty culture. I've heard that Seoul has many interesting skincare treatments and experiences, but I'm a bit unsure where to start.

I especially want to ask you all, what are some skincare-related things worth experiencing when you go to Seoul? For example, I've heard that some places offer various treatment programs, and there are also beauty districts to explore. My skin is usually quite sensitive, but I'm eager to try different products and methods. Has anyone been to similar places? What was your experience like?

Also, if I want to consult or try some professional treatment programs, are they all concentrated in a few specific areas? I'd like to plan my itinerary in advance, but I don't want to just skim the surface. I'd rather visit fewer places but have a more in-depth experience. Can experienced ladies share your insights? Especially advice on how to find reliable places and what to pay attention to. Thanks a lot!