Sandra publicly renounces her father after he disowns her, declaring she will now live only with her mother and take her mother's surname. As she struggles with the fallout, Sandra commits herself to prioritize her younger sibling, Carmy. At school, Sandra is introduced to Class 3, where an old childhood song triggers memories between her and Carmy, hinting at their close bond. Despite the family fracture, Sandra vows to care for her mother and sibling, but the tension between her and her father remains unresolved, leaving her future uncertain.