Two idols. One industry - K-pop. The dazzling heart of Korea, where every move is choreographed, every smile rehearsed. To the world, they're perfect. But behind the screens and spotlights, no one sees the exhaustion, the loneliness - the aching silence. Enter Naomi and Haechan. Naomi - stage name of Park Jieun - is Aespa and Aether's shining star. Elegant, composed, flawless. Haechan - the radiant force of NCT - is endlessly charismatic, talented, and secretly running on empty. They're the pride of SM Entertainment. Overworked. Overwatched. Yet undeniably brilliant. In their world, privacy is luxury. Secrets are currency. And yet, there's one secret even fame can't uncover: the soulmate system. In this universe, soulmates are assigned at birth. Some find each other early. Others wait a lifetime. Naomi gave up believing in it long ago - until her phone started buzzing. Every dawn at 01:27 a.m., a new SoundCloud notification. A nameless account. No messages. Just music. Always exactly what she needs. A lullaby for her panic. A beat to soften the ache. A piano melody that feels like someone knows her - really knows her. She doesn't know who they are is. But she wonders. The one meant for her? And while Naomi listens in silence, Haechan fights the urge to reveal the truth he's known for a while: his soulmate is closer than she thinks. Two stars lost in the same sky. Bound by fate. Kept apart by a world that watches their every move. Will music lead them home to each other?

Jamie Kwon is the girl everyone notices-confident smile, effortless charm, the kind of presence that makes people assume she has everything figured out. But behind the image is someone quietly unraveling, trying to adjust to a life that doesn't feel like hers yet. Mark was never supposed to be part of the problem. He's her sister's best friend. The boy who was always there. The one who felt like home long before Jamie ever arrived. Safe. Familiar. Untouchable. Until he isn't. Because somewhere between late-night conversations, accidental touches, and looks that linger too long, familiarity starts turning into something sharper-something neither of them knows how to name without ruining everything. And the worst part? He looks at her like he's already afraid she'll leave. While she's starting to wonder if she ever could.

When Yeon Sieun crosses paths with Choi Areum, he sees something in her eyes: desperation, yes-but also resistance. Their worlds collide. Sieun, usually emotionless and focused, becomes intrigued by Areum's contradictions. She's dangerous, but unwilling. Cruel, but clearly haunted. As tension escalates, Areum must choose: loyalty to the union that gave her power-or trust in the boy who sees the part of her she's buried deep.

Lee Hanuel was born with Seoul at her feet - daughter of Lee Reyeon and Lee Dahyun, the ruthless owners of Haejin Group and the invisible hand behind half the country's economy. Sculpted by privilege and sharpened by legacy, Hanuel doesn't flinch, doesn't falter, and never loses. Until someone starts reminding her of everything she was meant to forget. Anonymous threats. Scandalous photos. A name she's buried in guilt - a girl whose life was destroyed by her father's power. And somehow, Park Jihoon is always nearby. Sarcastic. Brilliant. Infuriating. The boy who's been her rival since high school. The boy who writes poetry that slices through glass ceilings. The boy who once said she'd rot just like the empire she'll inherit. As the attacks escalate, alliances blur. Secrets unravel. And in the shadows, someone watches - someone who wants to see the Lee legacy fall, even if it means dragging Hanuel down with it. Rivals. Enemies. Maybe something more. Because the line between love and hate was never the problem. Survival is.

Yoo Haewon has built walls around her heart. She's brilliant, independent, and known for rejecting every confession that comes her way. Love, she's decided, is messy, unreliable, and not for her-especially after seeing her parents' divorce up close. Enter Lee Donghyuck, an ambitious young Cupid-in-training with his first mission: make Haewon open her heart. Simple, right? Except she's the one target no Cupid has ever succeeded with. Armed with charm, persistence, and a few mischievous tricks, Donghyuck must navigate Haewon's icy defenses, the watchful eyes of elite Cupids, and the unpredictable chaos of human emotions. A story of mischief, vulnerability, and the delicate line between duty and desire, heart to heart asks: can a heart so determined to resist love finally let someone in?