President Yoon best hope that Kim Jong-un does not call him on this threat. For example if North Korea was to sink a ROK naval ship would President Yoon order the ROK military to then launch an attack against a North Korean naval base to sink multiple ships in response? If he does things can quickly escalate:

President Yoon Suk Yeol vowed Tuesday to punish North Korea multiple times as hard in the event it carries out a provocation against South Korea, after North Korean leader Kim Jong-un called for defining South Korea as a “primary foe and invariable principal enemy.”
Kim issued the call during a parliamentary meeting Monday, saying the country should revise its constitution to codify the new definition of South Korea and the North’s commitment to “completely occupying” South Korean territory in the event of war.
“The current Republic of Korea government is different from any previous government,” Yoon said during a Cabinet meeting, referring to South Korea by its formal name. “Our military has an overwhelming response capability. … Should North Korea provoke us, we will punish them multiple times as hard.”
Yonhap
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