Does anyone have any recommendations for post-treatment care product packages in Korea?

Hi! My name is Nan, and I'm preparing for a trip to Korea for beauty treatments. I'm currently thinking about post-treatment care products. Could anyone recommend what I should pack? I'm not sure if I can buy these in Korea or if I need to bring them from home.

I'm looking for things like cooling masks for post-treatment use, products to reduce general scarring, and gels or toners for nourishment and refreshing. I've heard some Thai people bring these items, but I don't know the brands or how easily they're available.

I'd love to hear from your experiences – what did you pack? Were they essential? Or are there any convenience stores or supermarkets in Korea where these items are easily available? Thank you in advance!