After the palace maid Su Nian died tragically in her previous life was reborn, she chose to serve the most inconspicuous third prince and grew up with him in the deep palace where fate was intertwined. From an orphan girl to a female official, from an abandoned son in a cold palace to a wise king, the two were each other's armor and weakness. In the end, she found her identity, but he allowed her to be free - to return to her home, not to be a prisoner.