@WhiteKnite
Yes it's just not worth it anymore to import eliquid. Especially when DIY is actually so easy. I still get my flavours overseas without issue and they are declared as flavor concentrates.
If you read the threads here, you will see members such as nwasiq and alljokingaside get their flavors locally from Ameliquid. I'm going out on a limb here, but I'm betting they will help you get set-up if you ask them.
PG/VG is also readily available in Korea through Gmarket.
And yeah..customs is certainly on to the "essential oils" labelling. It's a red flag!