@Petronella1
Email the guest and ask them how to pronounce their name in English...you may find they also have/use an English name in addition to their Korean name.
Reviews: are you sure you have looked at their profile details - if it says there are 3 reviews ,then just click on that link and you should see them.
Finally - if you are using IB then check your settings. For example have you ticked the box that says only guests recommended by other hosts?
As for profile - if it's not too late, then just ask them are they on holiday etc...
I am sure it will be fine..