Angry Mom
앵그리맘 (original)
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.
Starring Kim Hee-seon, Ji Hyun-woo, Kim You-jung, Lim Hyung-jun, Koh Soo-hee, Kim Seul-gi, Kim Seul-ki, Jeon Kuk-hwan, Kang Moon Young, Yoon Ye-joo
Watch "Angry Mom" on Rakuten Viki released in 2015. It's a drama and family show, and has a rating of 7.5 out of 10 from Imdb which is usually fine for this kind of show, and is currently available to watch for free.