Has anyone seen proper results from Botox in Seoul..?

I'm looking into getting Botox in Seoul, and I'm curious about the effectiveness. I'm debating between jaw Botox and skin Botox. When I read reviews, there are many people saying the results are great, but there are also those who say they didn't feel any difference as much as they expected, so I'm confused. I was looking up reviews for shoulder fillers and saw that many people get them done together, so I'm wondering if it would be better for me to combine them. For those who have actually experienced the effects of Botox in Seoul, I would be grateful if you could let me know how many weeks it takes to see results and how long the effects last. I want a natural change, but I don't want it to look too obvious, so I'm even more conflicted.