Chang-sik, a retired man, lives with his wife, Gilsoon and her caretaker, Soo-ok, an illegal immigrant. One day, a bedsore develops on Gilsoon, which does not seem to heal. Even though Gilsoon is in poor shape, Soo-ok insists on taking time off on weekends. Chang-sik realizes Soo-ok is trying a sham marriage for a new visa. Upon hearing this, Chang-sik suggests they get married.
Bo-hee, a 14 year old boy, was raised by a single mother and has always thought his father had passed away. Bo-hee hears that his father may be alive, and he sets out in search for him with his best friend Nok-yang. He finds his half sister on the way and forms a friendship with her boyfriend.
A storm is coming; the winds are getting strong. The real source of the ominous winds lies with Jina, who finds the strange word 'LingLing' written in her father’s notebook. She suspects he is cheating on her mother, who appears to be bored with life and fills the house with potted plants as if to show for her apathy. The film too is riddled with images of humid air and foul-smelling water, impure and overflowing. The sway of her father’s fishing pole and the flutters in Jina’s skirt seem perilous and unstable. When her anxiety and doubts finally come to a head, the family squarely face the rough downpour brought on by the storm. The director’s talent in boldly translating the characters desires and sensibilities into a narrative with powerful imagery is quite impressive.
A young girl finds her ideal type in a small bathhouse which runs by her mother. She is strongly attracted to something and awaits her. It is not possible to know whether the women's scent, which she has not yet had, is yearning for her.
A boy in early teens finds himself in danger of being demoted from his solo part in a choir due to his changing voice. He tries to fight against it, but to no avail.
Kyung-hye is having a minor friction with her daughter Ye-shin, who is going through puberty every day by day. Moreover, both Ye-shin and Kyung-hye are on edge because Ye-shin seems to have a boyfriend. But one day, Kyung-hye sees Ye-shin and her best friend Su-jeong kissing in front of her house.
20-year-old Jeong-hee doesn't go to college and works part-time. She goes to meet Min-young, her old high school roommate, for the first time in a while and wants to play with her as before. However, Min-young, a college student, is busy sending correction emails for her credits and feels uncomfortable by Jeong-hee's visit.
When the app is launched, a ghost appears. Developed by four young adults, the app becomes the centerpiece of a livestream where they venture into a supposedly haunted mountain to prove its authenticity—only to meet a grim fate. This chilling event kicks off Unlock, a horror anthology composed of seven short episodes. The series begins with App the horror, followed by The Night Bus, which unfolds on a long-distance bus; Ominous House, which features a ghost-conjuring ritual; The Collector, about the brutal fate of a man who watches an illegal video; Snuff Film, revolving around a vengeful director whose footage was censored; Sweat Home, where a woman's return to her family turns into a nightmare; Haunt, featuring a man paralyzed from head to toe who begins to see ghosts; and Dawn Call, about a group tasked with cleaning up a murder scene in the dead of night.