The Park family's eldest son died during the blizzard that crippled their village. They couldn't bury him because the ground was frozen solid, so they simply placed his body on the street outside their house. While out foraging, Kim saw the lump covered in snow, and realized what it was.
↑Welcome to Dystopia: 45 Visions of What Lies Ahead, Gordon van Gelder, editor, loc. 1587, ebook.