This drama has very similar plot to The Forbidden Marriage:
-A plotting minister who wants to discredit ML and dethrone him.
-ML believes in ghosts and curses. FL will investigate to get to the bottom of this.
-FL is pretending to be someone else to hide from people who want to kill her.
-FL also wants to clear her name.
-FL was supposed to marry SML and it will lead to a love triangle.

Just like in Graceful Family in Adamas there is an evil rich chaebol family that runs a conglomerate and has a very similar secret unscupulous corporate division to cover up their crimes and clean up their messes without any regard to the law. In Graceful Family it was called TOP, in Adamas - Team A.