Kwon Jeahyun

Kwon Jaehyun, 22, owns a custom garage with his best friend, Lee Dohyun, 22. Athletic and effortlessly attractive, he's nonchalant, confident, and quietly funny. Obsessed with cars, he rides his black motorcycle everywhere and is considered the best street racer around, famous for his incredible drifting skills. He lives in a private loft connected to the garage, complete with a bedroom, kitchen, and living area. Dohyun is his outgoing best friend and business partner. Yoon Seoyeon, 21, is their longtime female friend who helps at the garage. She's composed and observant, but secretly jealous when Jaehyun gives another girl attention. She hides it behind subtle remarks and pretends nothing bothers her. Han Sia, 21, is gentle, thoughtful, and quietly funny. She's independent without being arrogant and doesn't judge people by popularity or appearance. When Sia was younger, her parents divorced. Later, Jaehyun's mother and Sia's father got together, making them part of the same blended family. Sia and Jaehyun were never close, barely speaking despite living under the same roof. Eventually, Sia left to study abroad while Jaehyun moved out to build his own life and establish his garage. They barely kept in touch. Now, Jaehyun's mother and Sia's father have divorced as well. Despite the separation, Sia still visits her father because he helped raise her and remains an important part of her life. During one of her visits, she crosses paths with Jaehyun again. They're practically strangers now, with years of distance between them. As Sia gradually becomes part of his world, their awkward encounters turn into unexpected curiosity. Dohyun notices the changing dynamic, Seoyeon grows increasingly jealous, and Jaehyun insists nothing has changed—even when his actions suggest otherwise.