I’ve seen a couple of people ask “Why didn’t they ever finish making a vaccine?” in regards to Kipo S3. I think you guys are forgetting what a vaccine is. Vaccines don’t reverse a disease or help you if you already have it, they just prevent you from getting the disease if you are exposed. The idea of the vaccine in Kipo was to prevent mutes from being “cured” if they were exposed to the cure, but it doesn’t help those that were already cured.
Honestly I don’t think there was a way to reverse it. Mutes are mutations of animals we know today. The cure removed the mutations from their DNA and put them back in their “original” form. I don’t know a ton about biology but I imagine it would be very difficult to ADD a mutation to someone’s DNA in the exact same way to change them back. I think it’s likely that Camille, Yumyan and all those others that got changed are stuck that way.
Also for the people thinking "yeah but Song and Lio already know how to turn animals into mute cause they did it to Hugo". Yeah they knew how to turn normal animals. Not mutes turned into normal animals. Once Emilia's cure was into their veins it change everything, Song's formula wouldn't have worked.
And no she couldn't have make research to find a way to turn them back, look at how they found the first one. Song and Lio hated how Emilia forced them to test 3 formulas on Hugo everyday, it was super dangerous and straight up animal abuse. They wouldn't have done it again if they had a choice, even to help mutes.











