The Japanese government should just ignore something like this since it is in a private garden and not sponsored by the ROK government. Responding to this just drives further attention to it:

The foreign ministry said Tuesday that international courtesy for foreign leaders should be taken into consideration, after a local botanical garden reportedly installed a pair of bronze statues of Japanese Prime Minister Shinzo Abe bowing on his knees before a wartime sexual slavery victim.
Korea Times
The garden in the eastern county of Pyeongchang plans to unveil the statues next month, according to local media reports. Its sculptor told local media that Japan must atone for wartime atrocities until South Korea accepts and forgives it.
Japan has bristled at the statue, with Chief Cabinet Secretary Yoshihide Suga telling reporters Tuesday that the installation of such a statue, if true, is “unacceptable” and would “decisively affect” the relations between the two countries.
You can read more at the link, but if Japan is so upset about this then a private individual in Japan should make a statue of President Moon Jae-in bowing in forgiveness to a Vietnamese woman for the atrocities some ROK troops committed during the Vietnam War.








