Nam Woo-joon is just an average junior player— quiet, unremarkable, and always standing in the shadow of his idol: Seo Si-won, a badminton genius and national representative. Woo-joon has always admired Si-won from afar, never thinking of him romantically. But one night changes everything. After waking up to find Si-won doing something unthinkable while he's asleep, Woo-joon's simple world is turned upside down. What begins as confusion and betrayal slowly unfolds into something deeper, as layers of longing, misunderstanding, and emotional tension rise to the surface.