According to the Kou family's investigation, Princess Xi, as the Queen's close aide, has always harbored ill intent.
Even before the Queen's death, Princess Xi secretly developed her own power under the Queen's name.
Later, when her wings had grown, and she no longer needed the Queen, Princess Xi used her Cataclysmic ability to secretly poison the Queen.
Since the Queen's health was already not good, and Princess Xi used a very special slow poison, neither King Kang nor the Queen noticed anything unusual.
Moreover, the Queen, being of noble status, could not undergo an autopsy. So this was easily concealed by Princess Xi.
The Kou family had been investigating this matter for the past two years but had little progress.
It wasn't until Princess Xi became pregnant, repeating her old tricks, intending to poison King Kang and rely on her young son to seize power in the Sanctuary, that the Kou family discovered several clues.
