Flipping through a copy of a recently obtained Korean history textbook used in pro-Pyongyang junior high schools in Japan, journalist Ryo Hagiwara points his finger to a section describing how North Korea's founding father, Kim Il Sung, and his Korean People's Revolutionary Army defeated the Japanese occupation forces in 1945 and drove them off the Korean Peninsula.

"Well, this reads as if Kim and his army single-handedly liberated the North, but this is not true. It's a known historical fact that Kim was an officer of the Soviet army's 88th Brigade at the time," Hagiwara said.

According to outside historians, the KPRA was a North Korean propaganda term for what was actually the Second Army Corps of a Chinese communist-led force that Kim was a part of during the 1930s and early 1940s before he joined the Soviet army.