Kwon Min-ryeong

Junseok is the head of human resources at a car parts plant. His boss tells him to cut down the number of people on the production line, and he must meet with each department head to make difficult choices. At home, his wife is suffering from postpartum depression and he tells her to have a day out, asking her to take care of the rent. She parks the car, with her baby inside, at the curb while making the payment, and loses the car. Meanwhile, Hyeontae, the head of the production line at the same plant where Junseok works, is distressed over having to ask fellow workers to resign.

Suyeon comes back to her hometown to find the sound that disappeared. She meets Kyungmin, whom she has not seen in a long time, and they realize that their memories are different when they share their stories.

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.