AMerci

Tanya Edom's position as the Crown Princess is revoked by her fiance, Crown Prince Malek, and she is replaced by his lover, Lady Celeste. 
Tanya was head over heels in love with the Prince and wanted to become an Empress worthy of him more than anything. She did everything she could to impress him but her efforts failed to draw his attention in the end

Devasted, Tanya doesn't know what to do, all her life she'd been working toward becoming the future Empress of the Empire, and now her dream had been taken away. 
However, after overhearing palace servants gossiping about her demotion, she realizes that her obsession with the prince and being Empress are dreams she should put to rest and try to do something else with her life.

Doing so leads her to get warped up in a conspiracy concerning the crown. She ends up helping the Imperial Army solve a mystery concerning mysterious letters being sent across the empire.

Rejected Crown Princess To Imperial Cryptographer

Tanya wondered when it could have happened had she had a boyfriend this whole time while she lived at the palace, and she just didn't tell her. Should was worried since she considered Rayna her close friend.

"Don't worry, it happened quite recently actually," she explained. "An arranged married set up by my father to strengthen my family."

Tanyas face softened as she sympathized with Rayna's situation. "I'm sorry," she said.

"Don't be, it's not all that bad, my fiance is someone I've known for a long time. He's kind of like a friend." She went on.

"So, in a way I'm happy. I'm definitely glad it's not some creepy old man, I'm getting married to," She said then laughed.

Tanya gave a small smile. "When's the wedding?" she asked.

"In a couple of weeks, I am planning on inviting you so I hope you will come," Rayana said.

You should be a court lady