First time going to Seoul for beauty treatments, a little excited! Seeking recommendations~

Hi everyone! I'm Ying, and I'm heading to Seoul next month. My main goal, honestly, is to experience Korean beauty and skincare firsthand, haha. I've already been using some Korean skincare products back home with pretty good results, so I'm really eager to experience it on-site.

I'd love to ask for your recommendations: besides buying skincare products, are there any treatments or procedures worth trying? I've heard Seoul has many beauty districts, but I'm not sure which areas are more reliable. I'm primarily interested in skin management treatments, like deep cleansing or soothing care. Has anyone been to similar places? How long does it typically take? What about safety?

Also, I'm wondering if there are any must-buy skincare products or masks. My skin is on the drier side and prone to sensitivity, so I'm looking for gentle yet effective products. If any of you have been recently, please share your experiences and advice! Thanks so much!