She was trained to kill without hesitation. He was the one man she was never supposed to love.As children, they made a promise beneath a tree—a secret song, a buried box, and a future they believed would belong to them forever. But before their love could grow, fate tore them apart.Years later, she returns as a deadly assassin, carrying years of pain and believing the boy she once loved abandoned her. Her latest assignment is simple: infiltrate the world of a wealthy, powerful man and kill him.Then she discovers the truth.Her target is the boy she never forgot.He doesn’t recognize her. He doesn’t remember their childhood, their secret song, or the promise they made beneath the tree. To him, she is simply the mysterious woman who has entered his life and awakened feelings he cannot explain.As old memories begin to surface, their growing attraction threatens to destroy everything. She must choose between the organization that owns her life and the man who unknowingly holds her heart. Meanwhile, family secrets, a dangerous rival, and a society determined to keep them apart threaten to turn their love into a tragedy.She was sent to end his life.But what happens when the only man she was ordered to kill becomes the only man she cannot bear to lose?In a world ruled by vengeance, can their love survive the truth?