خلاصه داستان : وقتی جو کانگ جا متوجه می‌شود که دخترش توسط برخی از همکلاسی‌هایش اذیت می‌شود، تصمیم می‌گیرد به عنوان دانش‌آموز مخفی در دبیرستان ثبت نام کند تا به قلدرها درس بدهد.

When Jo Gang-Ja attended high school, she was notorious for fighting. She gave birth to her daughter A-Ran in her late teens and became more responsible. Her daughter A-Ran is now a high school student, but A-Ran is bullied at school. Jo Gang-Ja decides to go back to high school to protect her daughter. Jo Gang-Ja becomes a high school student again.