Tax when buying a Rolex watch in the US and bring it to Korea?

[T-Man]

Hi,

I am a U.S. citizen living in California.
I am planning to buy a Rolex watch here and give it to a friend in Korea as a gift. I was wondering whether there would be any tax issue in this case.

1> Will I need to pay any tax for the watch in Korea customs?

2> Will I need to pay any tax if I buy the watch at a duty free Rolex shop in the U.S. and bring it to Korea? In this case, is it okay to bring the box and the warranty card with the watch?

3> Will there be any difference between buying the watch at a retail shop and buying it at duty free shop in the U.S. when bringing it to Korea?

Thanks in advance for any help!