I love a good genre mashup; whether a show is one half sci-fi and another half whodunnit, or horror inflected with comedy, it's always really fun to see material that doesn't just stick to one lane. In the streaming era, I'd argue that some of the biggest platforms (like Netflix) are starting to realise that these blends can work really well for audiences, too.
That would explain some of the logic behind its new show The East Palace, a Korean drama that does things quite differently. At points in its debut trailer you could think that it's going to be a traditional prestige historical drama, but as things go further you'll start to see that it's got heavy dashes of fantasy too, and a little horror to spice things up.