How do foreigners usually find a trustworthy clinic? And what should they check?

Hello, my name is Som. I'm planning my first beauty treatment trip to Korea, but I'm completely confused about how to find a trustworthy clinic. 😅 I see so many online, but I don't know how legitimate they are.

My neighbor, who has been to Korea before, said that language is very important and asked if having an interpreter is really necessary. Can anyone who has been there share which clinics are good at accommodating foreigners, and what should I check initially? I'm worried about miscommunication and wasting money. 😭

Does anyone know if consultations are free, and what questions should I ask when contacting clinics? Thank you in advance!