It’s been 10 years since Mr. Park’s gas station was attacked by motorcycle gangs. To get his revenge, Park hires a quartet of dodgy boys: a lethal puncher, a footballer with a killer high kick, a potbellied wrestler, and a video game addict who mastered the art of bluffing. But these employees turn out to be more dangerous when they demand their overdue salaries.

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.