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.
Kim Hee-seon
Ji Hyun-woo
Kim You-jung
Lim Hyung-jun
Koh Soo-hee
Kim Seul-ki
Jeon Kuk-hwan
Kang Moon-Young
Yoon Ye-joo
Cha Sun-woo
Park Soo-young
Seo Ji-hee
Choi Ye Seul
Kim Tae-hun
Oh Yoon-ah
Park Keun-hyong
Kim Ji-soo
Kim Ji-young
Jeong Sin-hye