Intern Jennifer's life takes a chaotic turn after a drunken one-night stand with her reclusive boss, James. In her haste to escape, she accidentally leaves behind her best friend Tina's resume. James, desperate to find the woman from that night, assumes it's Tina. Tina seizes the opportunity, stealing Jennifer's identity to move into the Wilson mansion and live as a billionaire's mistress. Meanwhile, Jennifer is promoted to James's personal secretary, forced to watch her best friend live her life while she guards the truth. But James can't shake the feeling that his secretary is the true woman of the night. It’s a high-stakes game of secret identities and stolen love.