Seongye Love and other apps sell a lot of products, so I was debating whether to use Jiui or Collagen, but I was told that collagen would not fall out any more, so I filled it up..! I had to wear panties down because I didn't have enough fat on my buttocks. They designed it to fit the shape I wanted, and most of all, I love that it filled out my hip dip. I was so scared of being in pain, but they held my hand and took great care of me, and fortunately, I was under anesthesia, so I wasn't too worried!! Good job on collagen!