Do I need to speak Korean to go for a consultation in Seoul?

Hi everyone, I'm Mai from Vietnam. I'm thinking about flying to Seoul for a consultation about some treatments, but I'm worried about the language barrier. I speak basic English but don't know Korean. Has anyone ever had a consultation there without needing to speak Korean?

I'd like to know if clinics usually offer English or Vietnamese support, or if I need to hire an interpreter? Does this affect the consultation cost? I've never traveled abroad for this before, so I'm a little anxious.

If anyone has experience, could you please share it with me? Thank you in advance!