I’m Not The Final Boss’ Lover

I possessed a character inside a game. I thought that since I ended up in this world, I may as well devote everything to the protagonist to see the true ending, but… I was tossed aside like a worthless rag. As I was trembling in outrage from the betrayal, an unexpected person appeared before me—the final boss of this ‘game’, Dark Knight Mayer Knox! 

“Jun Karentia. I would like for you to join my expedition corps, the Dark Knights.” 

He refused my refusal, and so I was half-forced to join his knights. Here I thought, the final boss can become the protagonist too, no? And I could get some revenge on the man who abandoned me along the way. But things didn’t go as smoothly as I thought. Mayer kept being overprotective… and then there were those strange rumors! 

“Is she that woman? The vice-captain His Excellency chose?” 

“I heard she’s His Excellency’s lover…” 

Hang on a second! The final boss’ lover? You’ve got it all wrong!