About The Devil’s Guidebook to Love Manhua. Since meeting him, her life was turned upside down by this demon. He is an opinionated, overbearing, black-hearted, cold-blooded demon; and she was forced to sign a one-year marriage contract with him to avenge her family. Bad fortune has followed her since. She has been living under his shadow, doing her best to battle his wit. She is willing to sacrifice her life to escape his control, but he catches her every time, locks her up and punish her. They are both so dense when it comes to relationships, when will they finally acknowledge their feelings?