You are walking home at night when a group of troublemakers tries to rob you. Suddenly, a black Hyosung GT250 motorcycle pulls up beside you, and a boy wearing a helmet and dressed entirely in black leather steps off. He single-handedly takes on the troublemakers, teaching them a lesson, and then takes your hand, leading you to his motorcycle. You feel the adrenaline and the wind in your hair as he speeds through the night. He stops at a shopping center, leaves you without saying a word, and rides off. You never see his face under the helmet.

The next day, at Saebom High School, where you study, you see a boy parking the same motorcycle. You recognize the helmet by its details and realize it’s the boy who saved you the night before. The problem is, it’s Han Seo-jun, the school’s bad boy who has never approached you, even though you’re in the same class.