well hyundai has lower general quality than toyota, they don’t last as long and have more problems in the same time frame than a toyota, which contributes to depreciation. that’s why used corollas can be so pricey is because they are well built cars that don’t have problems as much, where hyundai/kia are much more hit or miss. some people have over 200k miles on theirs, while many many others have issues ranging from electrical gremlins to destroyed engines, even on near brand new cars. another reason is that hyundai/kia actually own their own steel companies, meaning they can get certain high cost materials for much much less than other car manufacturers