Half-demon Bai Yu did not want to attack Chu Mu, because Chu Mu's White Nightmare Demon was the only descendant of Demonic Bai Yu.
However, now that Chu Mu had transformed into a half-demon, the concept had entirely changed. The previous White Demon was very weak, even if it angered and provoked Demonic Bai Yu, he would only regard it as a stubborn child trying to surpass itself and not take it seriously. But now, the White Demon had become a half-demon with a massive increase in strength, presumably reaching the level of an Invincible Emperor.
Half-demons themselves carry strong resentment, and when confronted with a creature that can pose some threat and provoke them, their resentment will naturally intensify and release an aura of ruthless cruelty.
Moreover, in the law of survival, there is no room for two half-demons. Demi-demonic Chu Mu cannot tolerate Half-demon Bai Yu, nor can Half-demon Bai Yu tolerate Demi-demonic Chu Mu!