I would like to know the tax-exempt scope of traveler's belongings.

The duty-free range of traveler's belongings is up to US$600, and the following items can be exempt away from the duty-free range:
For more information, please contact the customs office (http://customs.go.kr/ 1577-8577).

ᄋ liquor : 1 bottle (one liter, US$400 or less)
ᄋ 1 packet of cigarettes (with less than 200 cigarettes)
ᄋ perfume : 60 ml or less
※ Minors under the age of 19 are not exempt from duty-free for alcohol and tobacco.