What is the identity of the Fifth Princess?

In the TV series The Moon Rises to the Sea, the staff of the Fifth Princess refers to Toy Boy.

The word "face first" has different meanings. Face represents beauty and head represents black hair. These two words together mean "handsome man". In short, this is Toy Boy. It is said that this name was handed down from the Northern and Southern Dynasties.

The staff of the Fifth Princess, that is, the leaders, are not ordinary people. To put it bluntly, they are not handsome men, but male concubine and Toy Boy. This is enough to show the indiscretion of the private life of the Fifth Princess.

The fifth princess ending:

Although Princess Wu was born after the announcement, she didn't learn anything about gentleness and kindness after the announcement. Instead, he was overbearing and cunning, bullying Cheng Shaoshang everywhere. Finally, the Fifth Princess was imprisoned in the Princess House, and all the aides were beheaded one by one and placed in her house.