The Emperor's Lady-in-Waiting Is Wanted as a Bride (Manga) Volume 5 by Kanata Satsuki

After many trials and tribulations, Lyse and Sidis’s fake engagement has become a real one. Swearing to marry, the two return to the Razanate Empire, where Lyse lived in her past life. But problems within the empire lead to a shocking suggestion from Sidis’s imperial relatives—that they marry other people?! To ensure that never happens, Sidis decides desperate measures are called for...