As for the suspicions surrounding the Luo brothers, they went to extend their apologies to the Qin and Dong families with generous gifts a long time ago, right after the deaths of Qin Shi and Dong Yu. They were chaperoned by their elders.
Their sincerity was profound: they regretted not being able to protect the two girls!
Moreover, both Luo Ying and Luo Ning were "severely injured".
How they got their injuries, only they knew.
So from the beginning, neither the Qin nor the Dong families ever suspected that the whole incident was orchestrated by the Luo brothers. Almost simultaneously, these two major clans of the Heavenly Realm targeted a boy from the Mortal Realm, and by extension... the Realm Spirit backing him!
Holding the Realm Spirit accountable might seem baffled, but after contacting several major families, the Qin, Dong, and even the 'helping' Luo's did just that!