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Originally, Qin Yu had no great interest in the fight between Xie Shuling and Third Young Master Nangong, as regardless of the outcome, it had little to do with the big picture.
Even if it were for Xie Shuling's personal gain, she would not suffer much damage, because behind her stood not only the royal family of the Great Qin Kingdom but also the Wuque Sect.
Her existence represents the alliance between the kingdom's governing system and the Immortal Clan, and this is also one of the reasons why Wuque highly values her.
Therefore, whatever marriage that Third Young Master Nangong mentioned... Xie Shuling's attitude is not important, his attitude is also not important, what is crucial are the opinions of the royal family, Wuque, and the Fulong Capital.
So, whether they fight or not, or whatever the outcome, it doesn't matter.