The Villains Sweetheart Is The Male Lead

A 30 year old salaryman suddenly got into an accident and transported inside the best selling novel and hit afternoon series "The Princess Romance" He became the male lead "Celistiano "Celis" Elcano". On the day of the wedding they were interrupted by the novels greatest villain "Giovanni Elias De Garmo" who announces his love for Celis and he will take him out of the ceremony. In shocked, Celis couldnt do anything. What is happening to the story? Why did the villain suddenly took interest on him? Which route will he take?