Busy Killing and Watching Monsters

Goddess Jiu Xue is stunningly beautiful. She has only one sentence to sum it up: "You can't beat someone who looks good but doesn't pity her beauty." The prince of the imperial city is unparalleled in charm. She can only sum it up in one sentence: "A man who likes beauty and hates ugliness and behaves based on his appearance." ... Ahem, stop it. This is a story about the growth path of a demon king whose profession is to destroy demons...