There are two KARL hosted contests in Korea. Any ham stations in Korea are welcomed to participate.
All modes in all bands can be used but 40m SSB and 2m FM are popular.
Calling frequency for 2m band is 145.000MHz.
Report to exchange is RS(T) + KDN(Korean District Number).
KDN list in English can be found here in 'Information' menu.
New year’s day contest: January 1 from 00:00-24:00 KST (Korean Standard Time)
Independence Day contest: August 15 from 00:00-24:00 KST