The world is both beautiful and cruel.
By the same token, when you made a good wish, you have to be aware of this: in order to achieve this beautiful desire, you would probably need to make a cruel choice.
Princess Yunyue was willing to sacrifice herself for the achievements of other people, and this was undoubtedly a beautiful and noble feeling. And being moved by this feeling, Wang Lu did not hesitate to brave hardships and risks, to design and participate in the implementation of as-far-as-possible, close-to-perfection set of plan.