Jang Jaehee is a successful architect who has spent years building a career that takes her around the world. Returning to Korea for a prestigious project, she reconnects with her childhood friend, Mark, and finds herself introduced to his group of friends-among them, Jung Jaehyun, the enigmatic heartthrob of NCT127. Jaehyun is known for his playboy reputation, leaving a trail of broken hearts in his wake. Beneath his charming exterior lies a man scarred by a past love, one that changed him for the worse. He's closed off, avoiding any real emotional connection, and his friends worry that he's lost his way. But when Jaehyun meets Jaehee, something shifts. She's different from anyone he's known-confident, kind, and unafraid to challenge him. As they spend more time together, Jaehyun begins to open up, drawn to her warmth and sincerity. Jaehee, in turn, finds herself captivated by the man behind the mask, the one who hides his pain with a smile. As their worlds intertwine, both are forced to confront their pasts and the emotions they've long buried. For Jaehyun, being with Jaehee brings a sense of healing he never thought possible, while Jaehee discovers a love she never expected to find in Korea.