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.

I Have a Lover is described as the second chance romance between a woman who loses her memory and falls in love with her ex-husband with whom she formerly loathed to the core. Of course the unsaid explanation is usually giant misunderstanding or both characters were way immature and finally grows up the second time around.