In a word, judging from these two diaries, X was not a good person, even worse than Luis.

Luis was indifferent to Victoria, but he wouldn't take advantage of her, while X was incompetent and selfish. He sacrificed his beloved woman and children for his safety. This man deserved to die even more.

However, could X be the murderer who killed her sister?

Grace looked through the back diaries again. There was no mention of X in the back diaries, but one of the diaries was full of dried tears. The diary said that Luis wanted Victoria to abort the child for the same reason as last night. Victoria was...