Seoul's foreign ministry has expressed "deep regrets" over Tokyo changing its textbooks to remove words that show the coercive nature of Japan's wartime sex slavery.
This comes as the Japanese government approved textbook publishers changing the term "military comfort women" to "comfort women" apparently to whitewash its past atrocities.
It also erased the word "forced" from the phrase "forced conscription" when describing forced labor victims.
Seoul's foreign ministry, citing testimonies of survivors, said that it is an "undeniable historical fact" that Japan had forced victims against their will.
It added that the fact was also proven by Japan itself and the international community, urging Tokyo to show sincerity in resolving the historical issues.