The heroine is the only daughter of a wealthy family and a top criminal investigation master. She enters the business district of the imperial capital in order to find criminals who have changed their appearance.
The male protagonist is a business tycoon and a powerful criminal investigation expert, on par with the female protagonist.
The male protagonist knows the identity of the female protagonist's criminal investigation master, but the female protagonist does not know the identity of the male protagonist. They often exchange information with each other on the Internet to jointly handle cases.
On the surface, the male protagonist and the female protagonist have been friends for many years. The male protagonist has been deeply in love with the female protagonist for many years and the female protagonist has never known it. The female protagonist once joked with the male protagonist on the Internet that she would marry the male protagonist if he could exceed his points on the criminal investigation ranking. The male protagonist was secretly attracted to her.
