I am looking for a manga about a princess who was brought up by her mother as a prince otherwise her father, the king, would have killed them.
The king was bad and a murderer. He was killed by the rebels.
Before they could find them, the queen told the prince/ess to run away and love as a girl. The girl did so. The mother killed herself and all that new the prince secret.
The princess runs and lives like a girl. She is solved as a slave to a family who used to be on her father's side.
To make sure of their loyalty to the new king, they are told to give away their daughter for marriage to the kings right hand man. They send the slave instead.
The man found out right away that she was their slave, not their daughter, but keeps her there anyway. They grow close and together.
His army comes and some of the man realizes that she is the prince, they used to serve her as the prince. But they dont get involved and say anything.

Light and Shadow (Ryu Hyang)

pretty sure, only read a few chapters

Just a depressed asian walking by, pay no attention