I watched this on YT on one of the Chinese Movie Channels, I was first skeptical about this.
The movie is the story of two maids who entered to palace as a child. Chen & Liu quickly became friends and they promise each other to be there for each other. Chen has a different personality comparing to Liu, While Liu is more kind, soft hearted, helpful, Chen is the opposite.

The story is about the relationship of two friends with the 13th Prince

Chen betrays her friend for power, she didn't want to stay in the palace forever and be a maid.

On her way to power Chen not only took her friend Liu's identity she also had an affair with the 4th Prince thinking she could be one of his favourite ladies. While being married to 13th prince this affair continued.

When the 13th Prince was going through hardship it was Liu who was there for him.

it's a happy ending but I didn't like the rushed ending.

It was a pleasant watch, I didn't fast forward or skipped any scene, at the end it was not bad.

I suppose this movie inspired Scarlett Heart and the other palace movies...