The movie Endless Rain follows the story of three young Koreans who are struggling to find meaning in their lives. Young-ho, the protagonist, has been studying for three years to enter a university but has lost his passion for education. So-yeon, his childhood friend, is sick and unable to fulfill her dreams. So-hee, So-yeon's younger sister, is frustrated by her stalled life and feels invisible compared to her more successful friends.
When Young-ho sends a letter to So-yeon, hoping to reconnect with her and find inspiration for his own life, So-hee intercepts it and responds in her sister's name. The two continue to correspond via letters, with So-hee posing as So-yeon and sharing her sister's hopes and dreams for the future.
As Young-ho and So-hee's relationship deepens, So-hee struggles to balance caring for her sick sister with her duties at the family's struggling bookstore. The pressure of her responsibilities becomes overwhelming, and So-hee begins to unravel.
Endless Rain is a poignant and bittersweet tale of identity, sacrifice, and the struggle to find one's place in the world. With its complex characters and emotional depth, the film is sure to resonate with audiences of all ages.