Not a new proposal, just a different country. Stupid idea that looks good as long as you do not look too closely.
With you for sure. Here in San Jose CA a group of con men almost convinced the city council that a set up of speakers could be posted along the freeway and could cancel vehicle noise by inverting the sound waves and sending them back at the traffic. I don’t know how but this foray into the world of Si Fi got stopped before they got ahold of the taxpayer’s money.
So Korea should have engineers who can stop this ploy.