I'm in a Secret Relationship with the Emperor and I Don't Know About It

I've reincarnated into a romance fantasy novel where the war-loving tyrant emperor falls for the sunny saintess heroine. 'The emperor entering into a contract relationship with the heroine and then falling for her is something only the high society cares about.' For a lowly manager at the imperial palace, tomorrow's overtime is what really matters. Still, living diligently like a commoner, I somehow ended up with a handsome boyfriend as if it were a reward... 'For the entire time we've been dating, you only held my hand, and you think we'll kiss at the wedding?' 'You'll regret it.' 'I won't.' You can't take back words you've already said... Turns out he's too handsome for just an extra. 'Lina, are you planning on sleeping with the emperor and then running away?' (Source: Kakao Page)