Defense
If you want to go to Korea you'll need a good defense.
Things in Korea haven't been on the safest side lately, so make sure you have some ways to defend yourself before you go.
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You need a good defense to go to Korea, so you fill your pockets with acorns (えい). When you get to Korea you plant them all around yourself. In no time you'll have a strong tree defense, keeping you safe.
Okay, so maybe this defense strategy will take a while, but you aren't rich and acorns are on the ground for free. Don't judge!