Emerald Bloom has always seen the world through a camera lens. Photography is her escape, but when the sun goes down, Emerald has another secret; a need for speed. After moving to a new city, she finds herself drawn into the world of illegal late night street racing, where nobody knows her real name or what she looks like behind her mask. Then she meets the God of Speed. He's undefeated. Arrogant. Mysterious. And determined to stay at the top. Emerald is the first racer who refuses to let him win. Every race becomes a battle. Every glance becomes a challenge. And with their faces hidden beneath masks, neither knows the identity of the person they can't stand losing to. But when the sun rises, Emerald has a new neighbour. Lee Heeseung. Charming. Familiar. Her unexpected friend. Soon, they become closer than either of them ever planned, sharing secrets, late night conversations, laughter, and pieces of their past they've never trusted anyone else with. Neither of them knows that the person they're slowly falling for is the very same person they're desperate to defeat. As the line between friendship and rivalry begins to blur, old wounds resurface, secrets threaten to unravel, and fate starts pulling them together in ways neither can understand. Because sometimes, the person you're destined to love... is the same person you've sworn to beat.