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Letting Xiang Qiang and his men go was a decision Wang Yu made after deep contemplation.
As he had said, he was moved by the self-sacrifice demonstrated by Xiang Qiang and Ding Hao, but what ultimately led him to spare them wasn't that reason. It was their current identities as CSD Special Agents rather than assassins.
That day in Capital City, before he left Dragon Protection for the Oriental Divine Sword Special Forces, Deputy Leader Song had a brief exchange with him before he got on the vehicle. Deputy Leader Song had said he hoped that Wang Yu would strictly control his and his subordinates' behavior in the future, and not act out of assassin's law at will, because CSD represents the nation, and all their actions would be equated with the nation's image.