The arch-nemesis turns out to be the object of his secret crush.

Jiang Ying, a Chinese special agent, and Luo Jinghe, a shadow chaser, are tacit partners who have worked side by side for seven years. Forced into marriage by their families through a self-inflicted injury, they discover their fiancés are each other. Upon their first meeting, they feign ugliness to try and dissuade each other, signing an agreement to divorce a year later. During their married life, their similar professional backgrounds arouse suspicion, and they later uncover each other's true identities while jointly investigating a suspected traitor, L. From initial bickering and testing to becoming powerful allies, they ultimately fight together against a common enemy, clearing up misunderstandings and confirming the love they've held deep in their hearts for seven years.