It's the story of a guy's life, with no real SF or fantasy elements...except the narrative structure is such that there IS a surreal element to it, but it's not "fantasy" per se. It's really hard to describe this without giving anything away. Maybe I'd compare it to Annie Hall or something, where there's a lot of screwing around with meta-narrative that makes it seem magical realist, even though every individual issue is mundane enough.
Putting that aside, it's the story of a guy who wants to be a writer, to get out from the shadow of his novelist dad, but who ends up writing obituaries instead. Death is a big theme.
And yeah, it's kind of a brilliant comic. As you can probably see, there's no real "hook" (well, there is, but I don't want to give it away) but trust me, it's worth reading, if only for Moon and Ba's artwork. (For the record, that looked a lot more like Moon's artwork than Ba's to me, but apparently they both worked on it.)