Going to Seoul for beauty trip!

Like the title says! Might sound silly but I’m turning 40 soon and for my birthday I want to take myself on a trip focused around beauty! I have enough airline miles to take myself and my husband thinks all of the skin stuff I love and enjoy (facials, Botox, skincare products) is silly and NOT his interest. Which is why I want to specially just go alone and do what I want to do each day: one of those hair/scalp massage treatments, facials, Botox, massage, etc. Eat good food, enjoy a nice hotel room, and veg out! Have any of you been to Seoul on a similar journey and have any spots you recommend that I make an appointment at?