I drove from Seogwipo to Seongsan Ilchulbong in the morning, had lunch in one of the Sikdang restaurants, then drove to Gimnyeong Maze Park and Manjanggul Lava Tube (both are just 1 km apart) in the afternoon. After that drove back to Seogwipo.

The distance is not as long as you think. But you will feel it's a long journey especially if you venture from south to east, north to south etc., mainly due to the very low speed limit (average maybe 60 - 70 km/h only).

I just used 3 quarters of fuel throughout the 4 days, but that already costed me RM160 

You need to have a valid class D license that have at least one year validity (you can renew on the spot anyway), then you can apply for the international driving permit (idp) from jpj.

Bring two white background visa photo, pay RM150, wait for 15 mins. That's all.

I made the reservation through online 2 months before my booking date. My mistake, the date is 21th 10am to 24th 10am. It should be 3 full days to be exact instead of 4 calender days.

I didn't choose the cdw initially, however i have chose it on site when they ask me to add on. And the Total is 120K KRW.

They will pre allocate a car for you if reserve the car online. Aj rental car have half foodball field of cars for rent, it should be no problem walk in and request for the dedicated car, since the business in Jeju is not so good during winter (+boycott by china in my opinion). Off course the price will be more expensive if walk in. Not worth to take a risk as the reservation is free of charge.

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once you arrive jeju airport. head to aj shuttle bus pickup point and wait for the bus. 15 minutes interval time.

once you arrive aj office. take the queue number. show them your reservation number/form + idp + passport.
they will process and collect the payment from you after your confirmation. [pay by credit card only].

after payment. go to the designated parking lot to get the car and drive to the check point.
the staff will then check the car condition with you together and you need to acknowledge [they will skip this part if you op for full cdw]
they will also teach you how to use the gps.