This page may contain spoilers for the whole novel.
Zhao Yunlan is the Chief of the SIU in Dragon City and the Guardian.
He is a powerful magic user.
People are routinely surprised by his cleverness and hardworking mentality, because he presents an easygoing and undisciplined front. E.g. in chapter 40. Wang Zheng thinks to herself: 'she always thought that [...] he is probably not the hardworking type. But in only a few days, he already knows the Hanga tribe so well.'
Zhao Yunlan is described in chapter 1 as young, handsome, slender and tall, with upright shoulders, thick eyebrows, deep eye sockets, and a high nose. He looks serious and in authority, but he can switch to a very friendly demeanor in an instant.
In chapter 2, he is described from the point of view of a police officer: tall, slender and handsome, 'like a model from a fashion advertisement'. His outfit is derided as not very pleasing: 'a scruffy shirt, only half-buttoned, half of it tucked in and the other half not'. His hairstyle is compared to a bird’s nest.
But nobody can criticize him because he is the Chief. ('Chief Zhao is the Chief after all, no matter how messy he looks. Even if he ran naked on the street, lower tiered officers would probably have to praise him for trendsetting.' chapter 2)