They work 24 hour shifts, have a huge workload that turns them into domestic staff for the residents, and most of their shift is classified as being on break. I wasn’t aware of this job before and it’s uniquely dystopian even for the Certified Worst Korea in History.

A good article I found detailing some of the conditions: https://english.hani.co.kr/arti/english_edition/e_national/661390.html