@Ren Xi Yao What have you been reading? It clearly stated he only got engaged to her so he could be closer to her brother, who had light spirits capable of calming down his darkness overload. He also knew fully well she was genuinely in love with her but still kept the act up. In the end, he even killed.himself cause he knew his death would cause her extreme emotional and mental suffering. The guy is no way evil but he is the main cause she turned out the way she did.