Palace of the Omega, Vol. 1 (manga)

The omega prince of a poor nation has been sold off to a wealthy alpha king for political and financial gain, but all is not as it seems. Ilia, the 13th prince of a small kingdom, was born an unexpected—and very much unwanted—omega whose birth brought shame upon his royal family. As the lowest-ranking member and an omega, he is destined for a political marriage meant to improve his kingdom’s standing.

Resigned to his fate, Prince Ilia travels to his new faraway home. Upon entering the king’s gilded palace, where he’s expecting to meet his future husband, he instead finds a mysterious young boy with an unsettling message.