Lee Heeseung, 27, is a young and successful CEO of "Black Phoenix Corp.", one of South Korea’s most powerful tech companies. He has wealth, charisma, and a mind for business — but none of it matters anymore. Ever since his girlfriend Karina, a renowned war-zone doctor, vanished without a word six months ago, his days feel hollow. The world sees him as composed, but inside, he's spiraling into loneliness and heartbreak.

Desperate and broken, he leaves behind the boardrooms and glass towers. With his only faithful companion — his sleek black Harley Davidson — he rides off across the country, hoping to stumble upon a clue to Karina’s whereabouts. Each city, each clinic he visits, brings either disappointment or vague traces of her past.

While resting one night in a cozy, rundown tea house in Gangnam, Heeseung notices a mysterious figure eyeing his bike — Kim Sunoo, 23, a strikingly beautiful and audacious street-smart drifter with a sassy tongue and a talent for slipping in and out of trouble. Sunoo is a small-time bike thief who lives off con jobs and charm, but something about Heeseung’s sorrowful eyes makes him pause.

Sunoo is caught red-handed trying to steal the Harley — but instead of turning him over to the cops, Heeseung strikes a deal: “You talk a lot, you must hear a lot. Ride with me. Help me find her.” With nowhere else to go, and intrigued by this brooding CEO, Sunoo agrees.

Thus begins their unexpected journey.

They travel through cities, hospitals, and shelters. Sunoo uses his street smarts and silver tongue to uncover leads, while Heeseung drives forward with single-minded pain. Along the way, Sunoo sees Heeseung's hidden vulnerability — his insomnia, his soft-hearted gestures, his fear of losing love again — and against his better judgment, Sunoo begins to fall for him.

But Heeseung? He still whispers Karina’s name in his sleep.

Despite that, the chemistry between them builds. In stolen glances during bonfires, late-night confessions under neon signs, or bickering in cramped motel rooms, a bond grows stronger — one stitched with loyalty, pain, and unresolved longing.

As they inch closer to the truth behind Karina’s disappearance, Sunoo is faced with a heart-wrenching choice: Stay silent and remain by Heeseung’s side... or confess his love and risk losing him forever.

And when they finally do find Karina — she is not who Heeseung remembers. The truth is darker, and the closure... more painful than expected.

Now, Heeseung must decide: Does he chase the ghost of his past… or embrace the one who brought him back to life?