I was wondering if you went to a Korean owned salon for your digital perm? The reason I ask is that I (being Korean) have always had bad luck with perms at Korean Salons because they leave the chemicals on your hair too long!
I will have to stand up and defend the thousands of fine Korean owned and operated salons and Korean stylists that do not do this.
It is true that Asian and American Indigenous hair is naturally straight and reluctant to curl, so just as lightening products will be left on dark hair for a longer time, some curling products may be left on curl-resistant hair for a longer time.
However, any reputable salon, regardless of nationality or ethnicity of the salon owners, will be extremely cautious when chemical products are applied to hair, and if it would need to be left on too long, they will simply advise the client that such a process would be damaging to their hair, and suggest safer alternatives.
And if the client declines those, and insists on the chemicals, the stylist will decline to do it.
A really good and experienced stylist may be able to tell you, just by examining your hair, whether you would be a good candidate for a chemical process.
This is of course, ideal, but second best will be a stylist who will do a "test run" to see how your hair responds to a routine application, of a "conservative" chemical procedure, and go from there.
To use bleaching as an example, the stylist might try putting some on a lock of hair, and leaving it for the recommended time. If the hair shows no or very slight color change, that is an indication that for that particular head, bleaching is not a good option, since the bleach might need to be left on too long in order to achieve the desired color, and would very likely damage or destroy the hair.
And the same goes for chemical curling or straightening methods.
All this is to say that if you think you might be considering having anything done that involves chemicals, you cannot be too careful, or do too much research, when choosing a hairstylist.
Experience, talent, professionalism and skill are the things to look for, not a particular nationality!