Homeroom Teacher, Your Ex-Girlfriend Wants Her Money Back

Four years after their breakup, math teacher Lin Zhou unexpectedly becomes the homeroom teacher of his ex-girlfriend Su Xiaotang's cousin. As soon as they add each other as friends, Su Xiaotang shows no respect at all and demands that he pay back the money he still owes her for milk tea from years ago. Lin Zhou refuses to back down and takes revenge under the pretext of "educating" her cousin. Whenever the boy plays on his phone in class or fails to finish his homework, Su Xiaotang is repeatedly summoned to school. Amid their daily clashes and sharp-tongued banter, old feelings quietly rekindle, bringing plenty of sweetness and laughter.