The simplest and the fastest way to explain this manwha is quite simple. Bring two of the most hot headed stubborn people onto a ring. Ring a bell and watch them go off. It just so happens that the two most stubborn players in the ring are a male and a female who are both single, both capable, both in prime age for romancing.
Finally, if you add an old expression "Difference between love and hatred is paper thin.", you should have the perfect image of how the story is going to unfold.
That pretty much explains everything you should know about this manwha. Let me add a few bits of information.
The male protagonist is a young man (in 20s) whose family is a billionaire. His family runs a series of businesses, one of which is SJ entertainment where the male protagonist is working in at the moment. He has been successful in bringing massive profit for the company and his latest project is to make a drama. He needs a good story. He does have a candidate but the author for the story has refused to sign a contract; this is where his endless problems arise.
The female protagonist is a young woman (in early 20s). She is a successful author. After copyright troubles at work, she quit and decides to focus mainly on writing in solitary. Her latest novel is chosen by the male protagonist; this is where her troubles start.