In order to escape from a political marriage to an old prince, Liana, the princess of the empire, disguised herself and sneaked into the territory of the Demon Palace. However, she was detained by Dios, the master of the Demon Palace, on the grounds of "territory infringement". Dios forced her to sign a "contract bride" agreement, but he was actually attracted by her stubbornness and wisdom; Liyana was unwilling to give in, pretending to be obedient and collecting the male protagonist's weaknesses, while using medical skills and strategies to resolve the crisis in the Demon Palace (such as helping the disciples break the curse and quelling the elders' rebellion). In the process, Dios discovered the childhood trauma of his mother being killed by the empire. The two went from playing tricks on each other to treating each other sincerely. In the end, Liyana helped Dios put aside his cold blood, and Dios gave up the rule of the Demon Palace for her, and worked together to resolve the war between the empire and the Demon Palace, and achieve peace and freedom.
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