Whenever I see ads, they always say that if you just make your first top-up of 3,900 won, you'll get strong. But why specifically 3,900 won, not 3,000 or 4,000? Every game emphasizes 3,900 won.
Around 3900 won is just the sweet spot—not too much, not too little, but just enough to make you think, 'Eh, why not, let's give it a shot.'
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Wanna buy at 4000 won or 3900 won? Wanna sell at 3000 won or 3900 won?
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Odd-even pricing
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