Sangwon, under the hacker name SweetByteBaby, walked straight into the life of the assassin, Lee Leo, the assassin sent to kill him. He approached Leo with soft smiles, gentle touches, and words that felt trustworthy. He acted like the perfect lover, drawing Leo closer while keeping his true identity a secret. Every kiss was part of his plan, every sweet lie a step toward survival. For Sangwon, it was control hidden in tenderness. For Leo, it felt like love, even though it was part of the hunt. Leo enjoyed every moment. The voice that had teased him through the screen now whispered his name in the dark, soft and trembling against his skin. He let Sangwon play, let him think he was in control. But every kiss left a mark, every touch claimed him, and every breath pulled Sangwon closer. In the end, Leo didn't just want him. He owned him. "I told you, Baby. Once you're mine, you stay mine." "You should have known, Leo. I never stay."

Lee Sangwon is an altar server. Born in a strict religious family that believed love was solely for the opposite gender. Every feeling in his heart was called wrong, every desire a sin. Yet he could not stop caring for Lee Leo, the son of a powerful political family, expected to lead, to never bring shame to his name, and to protect his family's legacy above all else. Sangwon knew from the beginning that being with Leo would put everything at risk. His family would condemn him, and Leo's life and future could be destroyed. So he made the choice that broke his heart. To keep Leo safe, to protect the love they had, he stepped back and let him go. "The world will never forgive us if they see me by your side." "You call this protection? Baby, it is killing me."

Sangwon, a quiet student from the Literature Department, always daydreams about what it would feel like to be loved by Leo, the popular boy from the Music and Performing Arts Department. In the life he built between books and borrowed words, he created a story where they were the main characters, deeply in love. Each night, he keeps recalling things they never did, clinging to the happiness only his imagination can give. But when he sees Leo with someone else, his dream shatters. Reality strikes, and the warmth of his fantasy turns into guilt, guilt for loving someone who was never his and for holding onto feelings that were never meant to exist. Even without ever touching him, Sangwon still feels guilty as sin. "Even the thought of being loved by him felt forbidden."

A soldier named Leo, newly discharged from war, returns home with one mission left in his heart, to mend the misunderstandings he left behind with his ex-boyfriend, Sangwon, the man who broke up with him the day he was deployed to the war zone. He once promised himself that he would survive every bullet, every explosion, and every battle, just to find his way back into Sangwon's arms again. But after surviving the horrors of war, he comes home only to face a new kind of pain, Sangwon is already married. He survived the battlefield once, but can he survive the war of love and fight for him once more, if ever he finds Sangwon in his arms again? "The war didn't kill me. Your marriage did." "I still carry you in my heart, Leo hyung. Just not in my arms anymore."