
Joo Ah-rin is a transfer student who arrived after her older sister disappeared. She strives not to miss her sister's roll call response from behind the white door.
Joo Ah-rin does not want to push Tae-geon into danger, yet she cannot bear for her sister's name to be completely erased.
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Moon Ha-rin is a dawn delivery driver and the sole witness who received a delivery completion notification for a door that does not exist on the 17th floor.

Moon Ha-rin clings to the fact that the number on her non-burning visitor pass matches the order number on her thermal bag.

Seo Ji-hoo attempts to extract the cache of a sealed group chat to revive the voices of deleted residents.

Seo Ji-hoo suspects that the Blue Line is not a power line but a deletion line that burns complaint files.