Na Bo-ri (Gong Hyo-jin) was a legend in high school for being a troublemaker and getting into fights. After overcoming numerous hardships, she gets a job as a substitute teacher at her old high school. She is excited with the fact that she will be able to meet her old teacher, Ji Hyun-woo (Kim Da-hyun), whom she has had a crush on for years. But Park Tae-in (Gong Yoo), a troublemaker in her class, keeps getting her into trouble. As he gradually becomes attracted to her through a series of complicated events.
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