South Korea is set to demand UNESCO remove historical sites related to Japan's industrial revolution from its World Heritage list, South Korean media reported late Sunday.

The South Korean government has criticized a Tokyo exhibit introducing the Japanese sites, saying that it fails to show that Koreans were coerced to work at some of them during World War II despite a pledge by the Japanese government to make that fact clear.

The Culture, Sports and Tourism Ministry will send a letter to the U.N. agency by the end of this month to lodge the demand, Yonhap News Agency said, citing Jeon Yong Gi, a lawmaker from the ruling Democratic Party of Korea.