The truth of the genocide can be more complicated, such as the "Heavenly Tribulation Plan" in which the upper realm can cleanse potential threats from the lower realm, or the family itself is an ancient guardian with forbidden power sealed in its blood. Revenge is not only killing people, but also breaking some kind of cruel "order of heaven".
Su Wan is more than just a companion. She can be the other side of the "Xuan Yin Body" - the reincarnation of the ancient "Taiyin Star Lord", her memory and power gradually awaken, and her relationship with Ling Feng changes from guardianship to mutual achievement, and even mutual causation.