ใต้เส้นเรดไลน์

GT endurance driver Kai Mercer is pushed into a reserve role after refusing his sponsor’s sexual advances, while struggling with his father’s debts and his mother’s illness. Through an anonymous platform, Kai develops an intimate relationship with a mysterious man named Nox, unaware that Nox is actually Adrian Cross, his new team owner and a four-time World Endurance Champion. As Kai falls for both identities, Adrian’s secret creates a dangerous conflict of trust and power. When the truth is exposed, Kai walks away. After kidnappings, threats, professional investigations, and an ethics hearing, the two eventually rebuild their relationship, while Kai earns his place as a professional works driver.