Mediatek is the answer. Here is the link to there
Post# of 29251
They can manufacture literally the same design as many other models on the market. Not all the “specs” of the Odyssey are the same as the Umidigi S2.
Dig into the website and you can see Mediatek makes sense. The Odyssey is using the Mediatek processor. So it’s pretty obvious who’s manufacturing the phones.
https://www.mediatek.com