In a society where everyone changes day and night to adapt to a new climate catastrophe characterized by extreme ultraviolet rays, Inkyung, who lives with her older sister at work, works part-time as a home insurance advisor during the day when everyone else is asleep. No matter how many times she changes TV channels, In-Kyung, in the middle of the day, working on a boring broadcast that only shows people going out, gets a call from her sister, who she thought was sleeping in her room. She searches for her sister at home, but in her small two-bedroom villa, her sister is nowhere to be seen. When the bewildered In-Kyung cannot resist her sister's insistence, she grabs her protective suit and prepares to leave her house, when suddenly a strange older sister appears in her house. Unlike her sister on phone calls, she convinces In-Kyung to stay at home. Feeling alienated by her older sister's attitude, In-Kyung, who fled the noontime outdoors with her naked body, no longer stays in the shade, but opts to go out into direct sunlight, whatever the outcome.
To exercise more tyranny and repression, the ruling power has done something to its dissidents who exhale smoke when they breathe, and the agents must arrest these people wherever they find them. Oblivious to the law, a man meets one of the dissidents and it changes the course of his life, until he decides to immigrate to a better land with the dissident for a better life.
When teacher Nora returns home after being held by the government, the application of the Medusa protocol shows her in videos that she was supplanted by a robot identical to her. Discovering what happened in her absence between her husband and a non-submissive version of her could change her life.