- The heroine (Empress Zhao Yanqing): Killed her brother to seize the throne at the age of 16, took power with an iron fist at the age of 20, and was known as "Jade Faced Yama". Wearing a black court dress with dragon patterns, hanging the sword left by the late emperor on his waist, with eyes as cold as ice, he was alone in the middle of the night wiping the grasshoppers he had made for his younger brother when he was a child. He is decisive in killing others, but he only "connives" his younger brother internally - allowing him to get into trouble, but never allowing others to hurt him in the slightest (hidden political calculation of "using him as a shield").
- The male protagonist (Emperor's younger brother Zhao Yanchen): On the surface, he is a famous "devil incarnation" in the capital. He hangs around in buildings and houses, but in fact he is thoughtful and has a photographic memory. Because he witnessed the bloodshed when his sister seized the throne, he deliberately pretended to be a playboy to avoid trouble, and secretly set up an intelligence network. While exposing the assassination plot against his sister, he quietly helped her to get rid of her reputation as a "tyrant" (such as anonymously opening a warehouse to release grain).
