After entering university, Ye Ningxue is subjected to endless phone harassment by Zhang Yaqin, the mother of her roommate Bai Ruoruo, who views her as a free nanny for her daughter, urging her to take photos during class and calling her in the middle of the night to tuck her in, with an average of over a hundred calls a day. Unable to bear the harassment, Ye Ningxue turns off her phone, thus missing her grandmother's deathbed call. Filled with grief and indignation, she retaliates with a thousand callbacks. Through dual verification by the police and the school, the other party's face of spreading rumors and slanders is exposed, ultimately causing Zhang Yaqin to reap what she has sown and lose her position as a director.