"Devil's Favorite: Master Jin, Please Keep a Low Profile" was a novel about a girl who was reborn as a good-for-nothing teenager and was spoiled by a black-bellied and arrogant butler. The demon butler did not listen to the female protagonist, but the female protagonist realized that the butler did not listen to her anymore. This novel met the requirements of the title of the male protagonist who transmigrated to Demon High School. I'll recommend it to you. I hope you like my recommendation. Muah ~
It's not based on a true story. The plot and characters of 'The Devil You Know' are the result of the author's imagination and creative writing. There are no real-life counterparts for the events and individuals depicted in it.
The 'the devil you know real story' might be related to the concept that sometimes it's easier to tolerate a known evil or difficult situation rather than venture into the unknown. For example, in some workplaces, employees might put up with a bad - tempered but predictable boss because they fear the uncertainty of a new job or a new boss who could potentially be worse. It could also be a story in a horror or thriller context, where a character is haunted by a familiar, perhaps demonic, presence that they have some history with.