Wasn't controlled by the landlord, but by the management team which is paid by the condo fee. If you own the condo, you pay that fee, if you rent it from a landlord you also pay it. The management team I believe is hired by the residents committee which is elected by the residents. Sort of like an HOA, I guess? There were elections during my stay and we were invited to participate, but I didn't care enough and this was a temporary situation.
This was in a large apartment tower complex in the semi-countryside. Not sure if it's always like that, it's the only apartment I stayed in. In Seoul I've only lived in villas.
Perhaps it's a countryside thing because I've also noticed noisy public speakerphones in the streets blasting PAs about random stuff, but I haven't seen it in Seoul.
Overall though, the local governments do spam your phone with alerts about all sorts of remotely relevant (IMO) things on a daily/hourly basis. I find it annoying but it's just how it is here. Today they were spamming about possible debris from a NASA satellite deorbiting.
Here is a very collectively oriented society. That's my take on it. High trust communities, so much so that things like this are possible: https://mobile.twitter.com/AntoineGrondin/status/16123864859...