First time in Seoul for medical aesthetics, where does everyone love to go?

Hi everyone! I'm Shuting from Taiwan. I'm planning to get some aesthetic treatments in Seoul soon, but honestly, I'm not too familiar with Seoul and would love some advice from experienced friends.

I've heard that Gangnam and Apgujeong areas have a high concentration of aesthetic clinics and good reputations. But I'm not sure if I should squeeze into these popular areas, or if other places are also good? Has anyone had treatments in other areas of Seoul and have any recommendations? Also, where do you usually choose to stay? I thought staying close to the clinic might be more convenient, but I don't want to get ripped off too badly...

I'd also love to hear about everyone's experiences: Do you need to rest for a few days after the treatment? Does it affect your travel plans? I'm really quite nervous, so I'd be very grateful for any sharing! I hope to find a reliable place and kind people to point me in the right direction~