We would never imagine a visit to Jeju without the help of Victor: ahead of landing in Jeju, Victor made sure we have the booking in the hotel of our choice in spite of the hotel being fully booked. 
We had the pleasure of touring Jeju Island over two days with Victor. What a pleasant ride it was, what wonderful places he selected for us, and what an excellent yet un-rushed use of time! Victor is a master of friendliness: we were a group of 6 from the 4 corners of the planet and Victor's cool smile made us all feel welcome and made sure we were all comfortable in all aspects. 
Jeju proved to be full of all sorts of attractions spread all over the Island. We chose to tour it on our own the third day and quickly realized it was not the best decision: with Victor, the days were full, the commute and language were not an issue. On your own, you will see less and pay more.