After doing quite a bit of research on this story, there doesn't appear to be very many Korean urban legends surrounding an endless stairway and a creepy doll. The result then is something that feels like a mash-up of influences with only thin ties to previous episodes.
The doll's sudden smile may be in reference to the poster in episode 1 while the recurring motif of eyes - in particular pupils - is something that seems to tie everything together. They say the eyes are the window to the soul so this could be literal and be referencing spiritual elements from another world.
However, a lot of this is guesswork and with a vague story, this is another segment that could have benefited from some exposition to fill in the blanks. For now though, episode 4 delivers another pretty average dose of horror.
The doll's sudden smile may be in reference to the poster in episode 1 while the recurring motif of eyes - in particular pupils - is something that seems to tie everything together. They say the eyes are the window to the soul so this could be literal and be referencing spiritual elements from another world.
However, a lot of this is guesswork and with a vague story, this is another segment that could have benefited from some exposition to fill in the blanks. For now though, episode 4 delivers another pretty average dose of horror.
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