Choi Moon-soo

Each night, a homeless girl stays in abandoned houses to get by. In the winter, she leaves the cold environs of Seoul and heads to Busan, eventually finding an empty house in an abandoned part of town. She starts looking for a way to make a living, but it’s difficult to find a job with no home address, no ID card, and no phone number. She ultimately does find work, but her employer takes advantage of her and ends up firing her without paying any wages. No one seems to be on her side in this harsh and abusive world.

One day, Chang Hyeok learns about his friends' sad family stories and makes a big decision for them! He's going to solve their problems! Chang Hyeok's mother who is a judge is touched by his words and decides to use all her strength to help. The mother uses her status within the boundaries of the law to appear in a mock court organized by Chang Hyeok to resolve the pain of the children. Finally, the mock court begins!

For Hee-chul, a deliveryman, his future is unclear. His father, who comes to see him, is a violent alcoholic, and it is his grandmother who cooks for him. One day, Yeon-ju, a college student in a similar situation to Hee-chul, asks him to play the lead role in one of her short films. Hee-chul dreams and hopes for the possibility of finding a new relationship through film. But reality belies his dreams. His grandmother, who is tired of the grim reality of life, leaves a note saying that she can no longer live with him and moves out of his house to begin a brand new life. And soon after, his father gets involved in bad financial dealings and becomes a wanted man. Hee-chul realizes that he cannot rely on his family or lover and turns to the faint hope he holds for film-making.

On Mondays, when the theater is closed, actors climb a mountain. They have been climbing the same mountain every Monday for 15 years, carrying their pains, dreams, and goals in their hearts as they climb Seoul's mountains together.

A budding love story between a medical student and a nurse takes place in May 1980, during a time of civil unrest and military oppression in Gwangju.