Based in Korea, it's set in the Mok Myeok Tower.
Rainbow Six Siege's forthcoming expansion, Operation White Noise, is shaping up to be among the best. And why do I think that? Just check out the new Mok Myeok Tower in the video above. It's visually impressive, but just look at how open and vertical it is. And come to think of it, I've no idea how the attackers will actually penetrate the building. Will they enter via the roof?