Kwon Ra-on discovers that the blue thread leads to the west library where the original contract is hidden. The thread tightens her maid's oath.
Kwon Ra-on urges to go for the original contract even as her oath tightens, but leaves Harin with the choice to cut the thread.
More discoveries
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.
