Young CEO Ella inherits a fashion group, facing harsh opposition from the board and aggressive rivals. After being stalked late at night, she is assigned a personal bodyguard, Noah. Quiet and plainly dressed, he seems clumsy and unprofessional, leaving Ella dissatisfied. Unaware to her, Noah is the heir of a top global security group. He left home over ideological conflicts with his father and started from the bottom. The stalking incident turns out to be part of a hostile takeover plotted by her uncle Victor and an external consortium. Noah stays by Ella’s side, memorizing her coffee preference and allergies, and foils Victor’s repeated schemes. Warmth grows between them amid constant bickering, and they nearly kiss on a rainy night. Later, Victor exposes Noah’s wealthy background at a board meeting, falsely claiming he approaches Ella for a merger. Shocked and hurt, Ella fires him. Without protection, Ella is trapped by Victor in the top-floor office and forced to sign equity transfer documents. Noah breaks in desperately, presenting proof of his severance from his family’s business and Victor’s criminal evidence. Victor is arrested. With the crisis over, Noah hands in his resignation. "I no longer want to be your bodyguard, because I want to be your boyfriend." Ella tears the document apart with a smile.
