This series received a 15 billion won investment from MBC and Wavve for its production. It is labelled as "MBC's 60th anniversary special project"(Wikipedia).
"It was through Netflix that Hwang Dong Hyuk (Director) was finally able to bring his idea to life after 10 years of planning. “It’s a challenging project, so I was able to have physical and psychological freedom [through Netflix],” he said. This is the first time that the director has taken on a series rather than a movie, and was able to exercise more freedom about the story’s length, content, and worldbuilding."
https://www.soompi.com/article/1485301wpp/hospital-playlist-actors-to-star-in-new-variety-show-by-pd-na-young-suk
https://www.soompi.com/article/1485185wpp/lee-jung-jae-and-park-hae-soos-squid-game-unveils-main-poster-director-reveals-story-took-10-years-to-plan
You can request here - https://help.netflix.com/en/titlerequest
2) https://youtu.be/hrDZF2wMVyk