They have actually guessed that, although the Lee family and the Xi family are allies through marriage, but that was on the surface. After all, Xi Ningxi disappeared like a smoke, so the Lee family and the Xi family has no reason to remain as allies. Instead, the Lee family wanted to crush them because they have been humiliated twice, and because of that marriage. Xi Ningsu, David Lee's fiancée, eloped with a man. Then, his fiancée was replaced by a woman whom she doesn't like. The Xi family is already declining, and even if it has the Lin family's support, but the Lin family only prolonged the illness.
However, they didn't expect to hear another reason why the Lee family would destroy the Xi family. It's not that they feel sympathy to the Xi family. They are grim reapers that feel no emotion. Added to the fact that Huo Ling's death in this world is indirectly caused by the Xi family, so they actually hate them instead.
