TIL older school Chinese food restaurants in Korea deliver food with actual plastic plates meant to be returned. They also hire their own staff to do the delivery and retrieval. After eating you set the plates outside your door in a bag and they come pick it up. This was already normal way before most other delivery food got popular, so it's ingrained to the point where modern delivery apps (like Baedal Minjok) accommodate it and let restaurants elect to use their own staff and do this