Is breast surgery possible?

Hello sisters, I have been exercising for 5 years. As I lost weight, my breasts continued to fall and gain, so I had no upper breasts... and they even widened... um... if I lose too much weight, it looks like an A and I have a bit of fat, b75? No upper chest? 80a? But is it okay to fill only the upper breast with implants and correct the sagging? (I don't know if there are hospitals that do that)
 I just need it to be completely empty... All my underwear are too baggy, so I tried to wear them because I lost weight, but I can't wear them... I bought a lot of them haha. Qㅠㅠ That's why I want to wear them tightly. If you're going to compare it to modern times, there are some people who say you shouldn't do it, and there are also people who say you should really remove it later, but it's a damn thing... What would you do if you were sisters? It's difficult every time. I think it will work if I only have upper breasts... ㅠ Most people say not to have breasts ㅠ It's sad that it's not genetic.. Please help.. I looked into fat grafting, but it's different for each person.. I think about various things. I can't do it.. I'm doing it for my own satisfaction, but when I think about having to take it out later... I'm worried and I don't know if I want to make it full~~ Help me ㅜI don't want it to be too big ㅠ