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

"Not at all, I insisted on doing this, so you have nothing to apologize for," he assured her.

Why? Tanya asked herself. "I see," she responded. "Concerning my decision, I will take the time now to discuss with my brother how to proceed," she politely told him keeping her voice level. She couldn't make a decision just yet she needed to time think things over and figure out what was going on.

The two were silent as they stared at each other. Tanya was feeling awkward and desperately wanted to leave.

"Well then I will excuse myself," Tanya said hoping this was it and he had nothing more to say. The more time she stayed with him she felt like her emotions would explode. That and she didn't want ti risk upsetting him.

Tanya gritted her teeth. What does he want now? She asked herself worriedly. She met his eyes once more.

Solving the letter