I'm Secretly Dating the Emperor, But I Don't Know That

My perfect boyfriend was in fact the tyrannical emperor?

In a romantic novel where a bellicose tyrant falls in love with a Saint heroine like a ray of sunshine, "Carolina" reincarnates as an extra having absolutely no relation to the original plot.

In the daily life of Lina, a small-town girl for whom tomorrow's overtime counts more than a romance, a boyfriend with the physique of Apollo suddenly appeared, as if by destiny...

...I didn't know it yet.

"...Lina. Were you planning to use the emperor and then run away?"

She was far from suspecting that her boyfriend, the cutest and most adorable in the world, was the emperor!