Hi, has anyone applied in Seoul as a non-resident (tourist) and got approved?

I’m a US citizen on a tourist visa undergoing tests in Seoul for a recently diagnosed illness. I’m hoping to apply for DTV under soft power (medical) to continue with tests and treatment in Bangkok. I see on the Thai embassy website that I would need to be residing in South Korea - i find this a bit vague, does this mean the application is only open to residents, or can non-residents (tourists) apply as well as long as they’re in SK until the DTV is issued?

Grateful for any advice, thank you.