I found this comment from Youtube and I find it hilarious
It is also true majority of catchy kpop songs have something like "nanana" "wadada" "lalala" or something repetitive like that make the song catchy, even if you don't understand the language. On top of that first 50% of the song sound totally different than last 50% which make them perfect example of "experimental kpop song"
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Anyway he is going to Eurovision from Finland lol..