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Keep your valuable asset more safety.
Generally, we charge some product in one's credit card.
But now days, payment plan that used four secrete numbers for large charge have will damaged valuable asset by lost credit card.
We can't use! If we don't set secrete number,which is bottom of card.
This way is the same to another people.You have little effort.
But that give you more safe.
Gyeong San, South Korea