Shown on the stamp is Kim Jong Il and his father Kim Il Sung.
Kim Il Sung (born 1912) was leader of North Korea from 1948 until 1994 when he died. He outlived Stalin by 4 decades, Mao Zedong with 2, and stayed in power long enough to outrun 6 South Korean presidents, 9 USA presidents and 21 Japanese prime ministers. After his death his son Kim Jong Il became the leader of North Korea.
The North Korean goverment to this day refers Kim Il Sung as the Supreme Leader and the Eternal President.
Kim Jong Il was the son of Kim Il Sung (ruler of North Korea from 1948 until 1991).
After the death of Kim Il Sung in 1991 Kim Jong Il became the leader of North Korea. He ruled North Korea for 17 years ending when he died in 2011. Kim’s nickname in North Korea was “Dear Leader” to distinquish him from his father who is knon as “Great Leader”.
After his death, Kim was designated the “Eternal General Secretary” of the WPK and the “Eternal Chairman of the National Defence Commission”, in keeping with the tradition of establishing eternal posts for the dead members of the Kim dynasty.
After the death of Kim Jong Il in 2011, his son Kim Jong Un became the leader of North Korea and he still is (2019)