This is just like what the US did to my favourite monarchy 75 years ago

Are you referring to North Korea? The DPRK has a cult of personality thing going on, for sure. But that hadn’t developed yet, by the time of the Korean war. Rather the DPRK was a really quite vibrant multi-party Socialist democracy.

The overwhelming dominance of the WPK, and the ostensible sidelining of other parties and organizations in the Supreme People’s Assembly only starts to occur after the war. With the genocidal bombing of the Korean peninsula by the United States, and subsequent economic and diplomatic isolation, being the primary engine which drove political centralization.

Compare the results of 1948 SPA election results with those of 1957.

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