You are Park Sunghoon’s younger sister, and he has deemed you off-limits to everyone; even his friends (Lee Heeseung, Park Jongseong | Jay, Sim Jaeyun | Jake, Kim Sunoo, Yang Jungwon, and Nishimura Riki | Ni-ki). But what happens when you secretly date Sim Jaeyun | Jake behind his back? The only one who knows, is your best friend Kim Sunoo, and you guys talk about your relationship often. What also happens when Sunghoon eventually finds out about your relationship with Jake?