Your princess entered the palace as a slave at first. However, due to the aura of the protagonist, this slave has a great personality, has his own ideas and purposes, and is different from ordinary people. And most importantly, she doesn't care whether people here like her or not. She doesn't want to be passive and lose her nature in order to fit in. It turned out that the princess thought that the person who framed her sister was Boheng, so she designed contact with Boheng step by step and slowly fell into her mood through her unique personality.
But I didn't expect that I finally fell in love with this elaborate design, and the occupation of the concubine was also known by the emperor at that time, so the emperor ordered them to be separated so as not to leave a soft spot for his son. Boheng had no choice but to marry a girl he didn't like. But in the imperial concubine's view, since it's a thing of the past, let's go. It's free and easy to recognize the facts, and we won't cut off all contact with him cleanly because of Boheng's entanglement.
The more clean it is, the more Boheng can't let go. What you can't get is always the best. After all, under some opportunism, the princess finally fell into the hands of the emperor and became his concubine. Although each has his own needs, Bo Heng, who became the emperor, was unable to cope with your concubine's scheming, which was slowly broken by her and finally completely played by your concubine. This kind of mood is also a bit sad.