"Hey, over there, your girlfriend is passing by" "What? Do you want to die?" Lee Se-kyung is not good at anything besides studying. I am always bullied in that way by the kids at my school. When she goes out of school, she's a cheap girl herself?! Everyone doesn't recognize her because she's the complete opposite of school, and even adult men don't know that she's a high school student and begs Se-kyung to meet her. Tried to fool people and have some fun. What is that? Even if he is caught, his identity is found out by his classmate Ha Seon-woo?! The wandering, love, and youth of teenagers who are neither adults nor children. A sweet and spicy adolescent romance begins!