The South Korean government has expressed "strong regret" over Japan's decision to recommend the controversial Sado mine as UNESCO World Heritage and has "sternly" urged for a stop to such a move.
Sado mine is where at least a thousand Koreans were subjected to forced labor during World War Two.
In protest, Seoul's second vice foreign minister Choi Jong-moon on Friday night summoned the Japanese ambassador to Seoul, Koichi Aiboshi.
In 2015, Japanese industrial sites, including Hashima Island -- where Koreans were forcibly taken to work at coal mines -- were designated as World Heritage Sites following Japan's promise to acknowledge its use of forced labor.
But Japan is yet to fulfill its promise in this regard.
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