Intro. He Yu (32) is a successful car workshop owner in Guangzhou who lives a rigid, solitary life. Accustomed to working with his athletic body drenched in sweat and oil, he feels his world is complete among silent engines. However, his routine is disrupted when a junior high school named Lily (15) visits his workshop—not for a luxury car, but to fix an old, broken bicycle.
Initially, He Yu views the adorable Lily as a nuisance amidst his heavy workload. But Lily’s persistence and unusual boldness begin to bring a new spark to his monotonous life. Beneath her school uniform, Lily carries a long-standing obsession and a wild attraction that perfectly aligns with He Yu's deepest secrets. This encounter amidst the roar of car engines slowly transforms into a relationship that crosses the boundaries between a mechanic and his young customer.