The opposition party and these protesters do not care about the saving the oceans, if they did they would be protesting the stopping of dumping of waste water from Korea’s nuclear plants as well. Better yet they need to protest hospitals that give out CT scans which is more dangerous than the waste water being released. This is all about politics and sliming the Yoon administration:

Korean public sentiment over Japan’s release of wastewater from the Fukushima Daiichi Nuclear Power Plant is deteriorating rapidly, with the opposition bloc spearheading protests on Tokyo’s “irresponsible behavior.”
Korea Times
Despite the worsening public sentiment, President Yoon Suk Yeol remains silent on the matter, having Prime Minister Han Duck-soo speak for the government on the matter.
Reps. Woo Won-shik and Yang Yi Won-young of the main opposition Democratic Party of Korea (DPK), Rep. Kang Eun-mi from the minor opposition Justice Party and independent lawmaker Rep. Yang Jung-suk participated in a protest organized by Japan’s Social Democratic Party and a number of civic groups in Iwaki, Fukushima Prefecture.
“This protest is not about a fight between Korea and Japan, it is about taking action to protect the ocean and the future generation,” DPK Rep. Woo Won-shik said during the protest.
“The most appropriate way of recovering Japan’s reputation is an immediate stop of the release. Through solidarity between the two countries, Japanese people should fix the problems of the Fumio Kishida administration and Koreans should fix that of the Yoon administration.”
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