What kind of gas do you buy in Korea?

[Blue Bucket]

I've only put regular in my Veloster. I think their is a higher octane option at my gas station, but there are no posted octane ratings (I think its a Speed Mate). So what do you put in your Stinger? Do other stations have octane ratings? I should be getting my Stinger in a few weeks.

Edit: the options at my station, regular (yellow), and im not sure (in green). Again, no posted ratings (that I can tell).