How did Yun's baby die? (spoilers)
Did Yun's friend, Jung-Sook, drop Yun's baby out the window along with her own child? This seems to be the case, but in the flashback both babies are on the floor as Jung-Sook's daughter approaches her and crawls up her legs. The next scene is off Yun pleading with JS to bring that baby inside from the window ledge.
Can anyone shed light on this question?