A coordinator reads it against the partner centres' actual availability for your dates, then replies with a named program at a named centre and a fixed price. No account was created, and nothing has been charged.
The reply names which partner centre would perform the screening and which of its published programs yours is, so the price can be checked against that centre's own page rather than taken on trust. The four centres each publish their own list.
A quoted price is held for 60 days and charged on arrival in Seoul, not before. If the dates you gave cannot be matched to a slot, the reply says so and offers what is actually available rather than quietly moving you.
Do not book the hotel yet. Which centre performs your program is settled with the program, and the four sit in four different parts of Seoul. A room five minutes from one is forty minutes from another. The accommodation notes list the districts and what is near each.
Check the entry rule for your passport, if you have not. For most nationalities a screening trip needs no visa at all. The entry check answers it in about a minute, and if yours is a case that does need one, say so in your reply and it can be handled.
What you sent is stored for 90 days and then deletes itself. No IP address is stored with it. A one-line summary went to the team's own channel so somebody picks it up, and that line deliberately carries none of your free text, none of your medication note and no contact detail. The privacy page sets out who processes it and what each one sees.
If you would rather it were deleted sooner than 90 days, say so in a reply to your own request and it will be.