demon king and angle

Once there was a demon prince called wei wuxian( alpha) he used to help people,cheerfully in his live but everything turned out when he was 19 years his parents were killed;after that he overthrew the thrown and he became the king of wei dynasty and then he become heartless and he used to kill bad people and then he used to fight with other sect to expand his kingdom and every sect leader was scared of wei wuxian

There was second prince of gusu name lan wangi (omega) he is very cheerful person and trouble his elder brother lan xichen and his uncle when he went to night hunt in wen kingdom ,wen xu(alpha) first prince of wen dynasty when he see lan wangi he was attracted to wangi and when he told to his father they send red scroll to lan sect but they refused this marriage when wen rohan got this letter he was angry and then he send a letter that if he refused to marry wen xu then they would attack his kingdom ,when they got this letter they was worried because they knew that they could not fight against them so they was worried about fight ,when madam lan knew about it she advice them that lan wangi should marry wei wuxian because if any one could go against wen kingdom it was only one person wei wuxian because he knew demonic cultivation.