Wonkyung traveled back in time to 1984 in order to find out the truth.

"Aren't you desperate for money? I'll triple the amount you get, spend the night with me" - Back in high school, Choi Seungcheol was the cruelest kind of rich boy, the kind who made bets with his heart. She was the quiet girl he bullied, then tricked into trusting him, only to plan to break her heart. But somewhere along the way, the joke turned into something real... until his temper pushed her away for good. She disappeared, no goodbyes, no second chances. Ten years later, he finds her again in the hospital his mother owns. She's not the same girl, she's guarded, and terrified for her twin brother, who lies in a coma with a failing heart. The surgery he needs is too expensive, until the boy who once broke her makes an offer she can't afford to refuse. One night. One price. He'll pay for the surgery if she gives herself to him. What begins as a twisted deal spirals into something deeper. Guilt turns to longing. Power games turn to quiet promises. And he begins to change...not because she asked him to, but because losing her again might destroy him too. She gave him one last chance. Now he has to prove he's finally worth it.

"i passed with a 98, its not 100%. why would I be proud?" "because you gave It your 100%, I'll be proud of you for you" - All her life, she was second place-even when she came first. Yoon Yn skipped grades, aced exams, and pushed herself to be perfect but it was never enough. Not when her older brother skipped further, achieved faster, and seemed to shine brighter in their parents' eyes. Once, they were close. But constant comparisons turned love into silence, and her heart slowly dimmed under the weight of never being "enough." Then she met him. A boy who saw her brilliance before she did. Who celebrated every little win, stood by her in every failure, and never once made her feel like she had to compete. With him, she learned to breathe. To hope. To believe again. And through him, she found the strength to rebuild not just her self-worth, but the bond she thought she'd lost forever with the brother she used to love, and the family she almost gave up on.

"I'll eliminate anyone who touches you" - He ran from blood. She ran from pain. Together, they found something like home...until the world tore them apart. As a child, he escaped the horrors of his father's criminal empire haunted by the bodies, the fear, the silence. Alone on the streets, he was found by her. A girl who had run from her own nightmare: an abusive orphanage that taught her survival, not love. She took him in, protected him, and worked like an older sister to give him the life she never had. But he never saw her as a sister. She was his light, his world, his only reason to believe in good. When she discovered his true identity that he was a missing heir to a powerful family, she made the hardest choice of all. She sent him back. And he hated her for it. Ten years later, he's no longer the sweet boy she raised. He's become cold, calculated, and terrifying just like the father he once feared. And when fate throws them together again in the blood-soaked aftermath of her abuser's death, the past comes rushing back. She sees the same eyes. The same boy. But now... he's a killer. And the boy who once clung to her as a savior now clings to a love she never expected one that blurs the lines between what they were and what they could be. He'd do anything for her. Protect her. Love her. Even if it means dragging her into his darkness.

"I know my place in your life ma'am" - As the heir to a powerful family and living with haemophilia, Kim Ahyeon has always been carefully protected. But no one has ever made her feel safer than the boy from the orphanage. her first love, her secret joy. Since she was six, she found excuses to visit just to see him, even as the years and class divide grew between them. When he turned eighteen, her parents gave her what she wanted most, a way to keep him close. They made him her bodyguard. Now their bond is wrapped in rules and boundaries, with her love hidden behind polite smiles and professional distance. Until one day, she confesses only to be gently rejected. He says he's not good enough for someone like her. But what he doesn't realize is that he's already everything she's ever wanted. And by the time he begins to understand the weight of what he's lost, it might be too late.

"Its clear as day I married the wrong sister" - He married one sister for business. But he gave his heart to the other. To fulfill his dying father's final wish, Jeonghan gave up his reckless ways and entered a marriage built on duty...not love. His wife was kind, beautiful, and everything he should have wanted. But he didn't. Not until she introduced him to her younger sister. From the moment he met her, something shifted. The girl with quiet eyes and an untouchable soul awakened something real, something dangerous. He started treating her differently. Better. And the lines between loyalty and longing began to blur. Now two sisters are torn between love and blood. One holds his name. The other holds his heart. And Y/n knows it's wrong loving a man who should never have been hers. But the heart never asks for permission.

"I knew it was you all along, Kim Yn" - She's always been the forgotten twin-the quiet one, the spare, the shadow trailing behind a sister who dazzles. While her family fawns over her sister's spotlight, she finds comfort only in her grandmother's unwavering love. But when her grandmother is placed on life support and hospital bills mount, everything begins to unravel. Her father's business is failing. Her sister, a social media star, is engaged to a wealthy CEO in a loveless arrangement meant to save them all. But when the sister realizes her fiancé is only kind when she's not herself, she starts sending in a substitute-her twin. Pretending to be someone else was never supposed to be anything more than survival. But the more time he spends with the wrong twin, the more he feels... right. And when he discovers the truth behind the switch, he doesn't walk away. Because maybe, just maybe, he never loved the image everyone else adored. Maybe he loved the girl who was never seen.

"Its almost over, please don't make me fake it anymore when my feelings for you are real" - She's the daughter of a powerful businessman, constantly under watch, especially by the jealous ex who refuses to let go. Desperate to escape his grip, she pulls a stranger into her world-asking him to pretend to be her boyfriend. What she doesn't know is that he's loved her quietly since kindergarten. Their fake relationship begins as a lie, but soon becomes something neither of them can deny. Until the threats become too real, and she ends it to protect the one person who's ever truly cared for her. Years pass. She leaves behind her medical dreams, choosing the business world for one reason only: to find him. When he reappears as the head chef at the hotel she now runs, everything they tried to forget comes rushing back. This time, there's no pretending.

"I can't seem to forget you from that night" - She never meant to be there. He never meant to fall so fast. Dragged to a club against her will, a shy university student finds herself completely out of her element-until a chance encounter with a mysterious stranger leads to a night she'll never forget. He offers her safety, a ride home... and something far more unexpected: comfort, connection, and the kind of chemistry she's never felt before. She thought it was a one-time mistake. He knew it was the beginning of something real. When she discovers he has ties to her university-and worse, that he wasn't exactly single that night-guilt threatens to drown everything they shared. But he refuses to let her slip away, determined to prove he's more than his past. As fate pushes them closer through work, school, and unshakable desire, walls begin to crumble, and so do her doubts.

"let me show you how a real man treats a woman" - She was the best in the company-brilliant, driven, untouchable. But not to him. He saw her long before her heartbreak. The CEO with power in his hands and restraint in his heart, he never dared to cross the line... until the line vanished. When her boyfriend cheated-claiming her boundaries were too much-she was left shattered but not alone. Because he stepped in. He didn't just offer comfort. He offered everything. Dinners that melted stress away, gifts that reminded her of her worth, and patience when others demanded more than she was ready to give. He never rushed her. Never pushed. Just waited. Until she realized she didn't have to protect herself from him. Their connection burned hotter than she expected-and before long, she wasn't just the best in the company. She was the CEO's everything. And the whole office knew it-including the ex who let her go, now watching the woman he lost become the one everyone envies.