Choi In-hwan

Hwa-ja has been raising three daughters alone in Busan after her husband passed away. One day, the second daughter Hye-young comes back to Busan after having continuous setbacks in Seoul. While spending time with her mom, she accidently sees a letter written in Japanese, which triggers her curiosity. She starts to ask Hwa-ja about her past life and gets to know new stories of her mother that she had never heard of.

Yunhwa, who works at a shipyard to manage their livelihood after her husband′s accident, receives a notice of unfair dismissal. To make matters worse, their relatives suddenly come and try to take away the family land. Her son loses a large sum of money with Bitcoin, and her daughter dreams of escaping to Seoul while giving up her studies.

On the day of SAT, which continued to take place even in the era of zombies, high school girls drive themselves to the place of examination.