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The protagonist traveled to a parallel world similar to the European Middle Ages, and became a prince of the world's second largest country. In order to save a woman, he had no choice but to violate the taboos of the royal family and the sect, learn magic, and became a wild magician - a demon. Forced by the Emperor, he fled, and unintentionally established the Shadow Sect with other evil spirits, and he became one of the three apostles of the Shadow King... And the protagonist's initial escape was just to protect his father, queen, and wife...