The first cover has 2 stamps, the stamp on the left commemorates The 60th Anniversary of the Republic of Korea Marine Corps, which was issued last 2009, while the stamp on the right commemorates the 30th Anniversary of the Establishment of the ROK Women's Army Corps, which was issued on 1980. The second stamp used is related to the special cancellation used.
Inside are stamps with their brochures.
The second cover was sent to me in time with the Cover round robin event in My Philately.
The stamps used on this cover are part of the Korean Beauty Series (5th issue) issued last 1995.
First stamp : The Lofty Gate of the Traditional Yangban Residence
Second stamp : The Gate of Pomosa Temple
Third stamp : The Pullomun Gate at Changdokkung Palace
Forth stamp : The Osumun Gate of the Chuhamru at Changdokkung Palace
The third cover sent was sent last 2010-09-07 and has a special cancellation.
The first stamp is part of 2 stamp set for 2006 Philatelic week, with a theme called : "Heart-shaped fingerprints." The second stamp is issued for Philatelic week of 2001 and theme is "Heart of Love."