Worried about the budget for cosmetic treatments in Korea - does anyone have experience?

Hi everyone, I'm Tam from Vietnam. I'm planning to have a cosmetic procedure in South Korea but I'm really confused about the financial planning. I'd like to ask those who have gone through this before, what's the most expensive part? Is it the procedure itself, or the cost of flights, accommodation, and food?

I'm not sure how many days I should spend there. Can I have one examination and the procedure done on the same trip, or will I need to return multiple times? I guess it depends on the type of treatment, but could someone briefly explain it to me? I'm a little worried because my budget isn't very well prepared.

Can anyone suggest steps to plan a trip and cosmetic procedure that balances costs? Experiences from those who have gone through this before would be very helpful. Thank you!