Diana didn't understand why her father had never told her about her younger sister who was entrusted to the Weng family as a child, even adopted by them.
Diana also wondered in her heart, what was the relationship between Arya and the woman named Lucia? For a moment, she felt jealous that Arya had found another woman in Greece, and Andre said that Lucia had the same face as Diana.
Even though he is married to Ryan, it didn't mean she no longer loved Arya, who was much better than Ryan. Arya is rude, selfish, and annoying in Diana's eyes, but she is certainly not as cruel as Ryan, and not a man who liked to cheat or change partners.