Bok-nyeo starts looking after a blind man at the recommendation from her church minister. At the man's house, she finds a mysterious hole in the wall and notices that someone - or something - is watching her.

Jin-kyung works at the SOS Call of Hope center which picks up calls to help people with suicidal impulses. One day, she hears her dead sister's voice over the phone.

An aspiring flight attendant Soo-hyun agrees to a one-week part time job at a convenience store that pays strangely too well. What she thought would be easy money is - nothing like what she ever imagined.

Japanese chef May runs a restaurant that also provides delivery services. She notices a woman who orders from her restaurant every single day and gives her terrible ratings. It turns out that she lives just next door.

The night is long for Su-in, an employee of a private security company. An endless night begins upon hearing rumors about a man who went missing after being locked up in a backroom.