Angry Mom

The school board gets investigated for corruption regarding school violence. Kang-Ja tries to stand up for her daughter who gets bullied for protecting her friend. Go Bokdong threatens A-ran to back off and lay low.

A-ran gets admitted to the hospital due to the trauma. Kang-Ja decides to enroll in her daughter's school to find the perpetrator. No-ah gets offered the job as the language instructor at the high school.

Jo Bang-eul and No-ah Park face troubles on their first day at Myung-sung High School. Instructor Do gets appointed as Chief Secretary by Chairman Hong. Jin Yi-kyung attempts to take matters into her own hands.

Jo Kang-ja finds out Go Bok-dong is involved with Ahn Dong-chil and confronts him. Ms. Joo reaches out to Instructor Do for help. Jin Yi-kyung heads to the school to uncover the truth, but gets found and killed beforehand.

Oh A-ran arrives at Yi-kyung's wake, where she confronts Instructor Do about her death.Jo Kang-ja and A-ran argue about returning to school.

A-ran goes to the library to look for more evidence regarding Yi-kyung's death, while Instructor Do and Joo Ae-yeon enter their secret room...