If you're looking for manga similar to Ookami-heika no Hanayome, you might like these titles. All recommendations are made by Anime-Planet users like you!
In an ancient and mythological land called Saiunkoku, the people have begun to recover from a period of war and famine; thus, when an official from the imperial court offers the impoverished and beautiful Shuurei more money than she could ever dream of in return for a favor, she jumps at the chance. What she doesn’t count on, however, is being asked to become a concubine to the recluse Emperor and help him transform into a better leader. What’s more, the Emperor shows little intelligence, seems to have no interest in ruling, and is rumored to prefer men. One thing’s for certain: Shuurei has her work cut out for her!
Both manga start in a similar way, with the poor heroine finding out about a high paying job at the palace where she has to be the emperor's temporary consort/bride. While Ookami-heika no Hanayome is focused on romance Saiunkoku Monogatari puts its emphasis on politics but still maintains a dose of romance.
The long-lasting war between the Northern and the Southern Kingdoms is unbearable. So the northern Prince Johane and the southern Princess Euda decide to tell everyone they are in love, because their marriage can stop the war. But the truth is they don’t get along at all!
I began reading Zettai right after finishing chapter 45 of Ookami-heika and I immediately noticed some similarities.
The romance in both stories is very sweet.
In Zettai, Euda and Johan/Johanne (depending on the translation) have a more antagonisitic relationship. They originally hate one another for the war their kingdoms were fighting but they get together to save their people.
In Ookami Yuurin/Yuulin (again, translation) and Reishou get together so officials will stop offering their daughters to marry Reishou. Yuurin is being paid to be the king's consort and their relationship begins with friendship but they both begin to recognise their love for each other. Both of them doesn't believe the other loves them so they are resigned to the fact that they will part ways one day.
After that long-winded summary, if you liked one you'll like the other.