Corporate spy Chloe disguises herself as a rookie secretary to infiltrate Lu Corporation, aiming to steal the bid document and save the orphanage held hostage by the villain Damon. The shrewd CEO Ethan sees through her cover long ago, yet instead of exposing her, he uses his family private seal as bait, closing in step by step and claiming her publicly. As conspiracies unravel and Damon’s arson truth comes to light, Chloe’s spy identity is accidentally revealed. Ethan slams down their marriage certificate to protect her domineeringly. In the end, Chloe drops her disguise and becomes the mistress of Lu Corporation.