He is Mr. Brown. A billionaire CEO—cold, ruthless, untouchable, and famous for never keeping an assistant. Until a mysterious girl appears in his office after 8 PM. Barefoot. Black dress. Strawberry milk in her hand. Sitting in his chair like she owns it. No résumé. No record. No security footage can explain how she gets inside. Then she asks for one thing: A $1-a-day job. He changes the security codes. She gets in. He adds cameras. She disappears from them. He hires guards. She still appears. And then he discovers that his innocent little assistant has a secret life of her own. She isn't who she pretends to be. Neither is he. They make a contract to protect her. But somewhere between the office, the late-night park bench, and everything that happens after 8... the contract starts becoming real. No love. No attachment. No falling in love. Those were the rules. But rules were never meant to survive them.