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Gu Nian couldn't help but angrily rebuke upon hearing Xiao Yan's words, "You are truly bizarre in your way of thinking... You and my brother did the same thing, logically you should be able to empathize with each other, but what happened? You actually kicked him when he was down, despicable."
"Sang Yu never loved you, yet you presumptuously assumed she was yours... Sang Ran's death could have been avoided, but you didn't intervene to prevent this tragedy, and now you're using Sang Ran's accident as a weapon to harm my brother and Sang Yu, detestable."
In fact, Sang Ran's incident also hurt Fu Jingshen.
Sang Ran's accident occurred during Fu Jingshen's last command, and Fu Jingshen was even wounded because of it. Most importantly, Fu Jingshen felt a profound debt towards Sang Ran.
In short... What infuriated Gu Nian was that it was a tragedy that could have been avoided, yet it still occurred beyond prevention.