If South Korea really "writes" Japan-South Korea security cooperation, it is likely to lead to the breakdown of cooperation. Once such a result occurs, it means that the United States' attempt to contain China through Japan and South Korea will be broken, which will affect the whole pattern of Northeast Asia, and it can be said that it will affect the whole body. How big and bad the final impact will be, I am afraid that even the United States itself cannot predict clearly. No wonder the United States is eager to "sincerely" want Japan and South Korea to sit at the negotiating table and have a good talk.
It turns out that the Korean government has prepared 1 100 flags to boycott Japan. But the United States is willing to mediate, and South Korea is indeed subject to the United States and Japan. In desperation, the South Korean leadership demanded that all non-governmental activities to boycott Japan be stopped. Even the 50 flags just hung were taken down. Not only that, but even some anti-Japanese demonstrations by non-governmental organizations were stopped with the intervention of the Korean government. It can be said that in order not to completely break with the United States and Japan, South Korea can only sacrifice the patriotic feelings of its people.
Generally speaking, the Korean government is really helpless. Once Japan and South Korea break up, Japan will "cut off supply" to South Korea, with incalculable consequences. To some extent, Japan does not depend on South Korea, but South Korea depends on Japan. Without Japan, South Korea's economy and people's living standards will be hit hard. The only thing that can balance Japan is the United States. The only thing that South Korea can intimidate the United States is the security cooperation between Japan and South Korea, which forces the United States to intervene in the mediation between Japan and South Korea with the "overall situation". Since the United States promised to help, South Korea will naturally stop when it is better, and it is logical to stop all actions against Japan.