Interestingly, many scenes are different from the novel.
They decided to portray the emperor in the drama as if he didn't like FX. This is inaccurate. The Emperor actually favored FX, who was his preferred son. The emperor always wanted the CP until almost the very end, when he discovered that the CP and his aunt (the emperor's sister) were lovers.
In episode 14, the incident in the emperor's study never occurred. FX never exposed Cheng Ping, as it was prearranged between them to sow chaos and then dispel rumors in order to portray FX as incorruptible. Cheng Ping and FX genuinely respect and care for each other.
The storyline with the martial artist and three assassins never actually occurred. It was all part of the screenwriter's imagination. Similarly, the killing of the girl in the street and her father did not take place in the novel. The actual arc was darker, involving a brothel that abused and kidnapped young teens, and some of them were tragically killed behind closed doors.
Sidenote… FX exiled to a place few days away from the capital, nearby the official place of the revenue when he investigated and schemed and took over the smuggling who benefited the eldest princess and the princes. He came back to the capital. The revenue was handled by the eldest princess. Again SHE is the real villain in the novel. She was in love with the emperor (brother). In the novel, the emperor loved her but never crossed the line.
In the drama, I noticed several story arcs and characters that don't exist in the novel. They chose to reveal the genius mastermind FX after the events, whereas in the novel, we know what FX is planning before the events. As a result, the cunning personality of FX in the novel is much more obvious.