en CB01 OFFICIAL. Seojin lives with her mom, but they only see each other for about 10 minutes after Seojin returns from work in the morning. One seemingly ordinary day, everything changes when the emergency siren goes off. Suddenly, residents in the Seoul area are instructed to take shelter immediately. Though they live together, Seojin and her mom have rarely truly shared their lives — until now, as they begin to make an evacuation plan.